Polaris Partners

Polaris Partners is a venture capital firm founded in 1996 and headquartered in Boston, Massachusetts. With additional offices in San Francisco and New York, the firm specializes in investing across all stages of technology and healthcare companies, including life sciences and biotechnology. Polaris has established a strong track record over its more than 20 years in the industry, focusing on partnering with repeat entrepreneurs and innovators who are enhancing quality of life and work. The firm's investments are directed primarily within the United States and Europe, supporting companies from their founding stages to profitable growth.

William Allard

Venture Partner

Jonathan Ang

Entrepreneur Partner

Mark Augenstern

Associate

David Barrett

Managing Partner

David Barrett

Partner

Marissa Bertorelli

Principal

Mary Blair

CFO

Alexandra Cantley

Partner

Darren Carroll

Partner

Brian Chee

Managing Partner

Isaac Ciechanover

Partner

Alan Crane

Partner and Entrepreneur

Jon Flint

Founding Partner

Jonathan Flint

Founding Partner

Harold Friedman

CFO

John Gannon

CFO and Partner

Nil Gural

Senior Associate

Brendan Hannigan

Entrepreneur Partner

Rahul Kakkar

Entrepreneur Partner

Pat Kinsel

Partner

Scott Martin

Senior Associate

Eileen McGuire

Partner

Ellie McGuire

Partner

Terry McGuire

Founding Partner

Sabrina Chiasson

Principal

Pat Mulach

Senior Associate

Kim Png

Principal

Noel Ruane

Venture Partner

Jim Weinstein

Entrepreneur Partner

Past deals in Hospital

Nomad Health

Venture Round in 2022
Nomad Health, Inc. operates an online marketplace that connects healthcare professionals with freelance and permanent job opportunities in the United States. Founded in 2015 and based in New York, the platform allows doctors and nurses to search for positions by various criteria, including location and pay rate. By streamlining the healthcare staffing process, Nomad Health aims to simplify job searches for medical professionals and facilitate the hiring needs of healthcare facilities. This modern technology platform addresses the complexities of traditional healthcare staffing, promoting efficiency and accessibility in the job market.

Nomad Health

Series D in 2021
Nomad Health, Inc. operates an online marketplace that connects healthcare professionals with freelance and permanent job opportunities in the United States. Founded in 2015 and based in New York, the platform allows doctors and nurses to search for positions by various criteria, including location and pay rate. By streamlining the healthcare staffing process, Nomad Health aims to simplify job searches for medical professionals and facilitate the hiring needs of healthcare facilities. This modern technology platform addresses the complexities of traditional healthcare staffing, promoting efficiency and accessibility in the job market.

Iora Health

Series F in 2020
Iora Health, Inc. is a healthcare provider based in Boston, Massachusetts, specializing in primary care services across the United States. Founded in 2010, the company is committed to overcoming the barriers typically present in the healthcare system by offering personalized care for each patient. Each individual is assigned a dedicated personal physician and health coach, who maintain regular communication through various channels, including email, text, and video, in addition to in-person consultations. Iora Health employs a team-based approach that includes a doctor or nurse practitioner, nurse, behavioral health specialist, and health coach, all supported by a proprietary technology platform for effective population health management. The organization also provides educational programs, such as group visits, to assist patients in achieving their health goals and managing their overall well-being.

Nomad Health

Series C in 2019
Nomad Health, Inc. operates an online marketplace that connects healthcare professionals with freelance and permanent job opportunities in the United States. Founded in 2015 and based in New York, the platform allows doctors and nurses to search for positions by various criteria, including location and pay rate. By streamlining the healthcare staffing process, Nomad Health aims to simplify job searches for medical professionals and facilitate the hiring needs of healthcare facilities. This modern technology platform addresses the complexities of traditional healthcare staffing, promoting efficiency and accessibility in the job market.

Africa Healthcare Network

Series A in 2019
Africa Healthcare Network (AHN) has pioneered the first dialysis chain in Sub-Saharan Africa, aimed at delivering affordable, high-quality dialysis services for patients suffering from Acute Kidney Injury and End-Stage Renal Disease. In a region where existing facilities are limited and often charge exorbitant fees, AHN addresses the critical shortage of accessible dialysis care. The organization leverages its technical expertise and practical experience to establish well-equipped centers, while also focusing on training healthcare professionals to enhance service delivery. As Chronic Kidney Disease and related health issues rise due to urbanization and lifestyle changes, AHN's model prioritizes operational efficiency and cost-effective sourcing of medical supplies, thereby reducing treatment costs for patients. Operating in Rwanda, Tanzania, and Kenya, AHN is committed to increasing access to life-saving dialysis care, ultimately improving patient outcomes while ensuring financial sustainability.

Iora Health

Series E in 2018
Iora Health, Inc. is a healthcare provider based in Boston, Massachusetts, specializing in primary care services across the United States. Founded in 2010, the company is committed to overcoming the barriers typically present in the healthcare system by offering personalized care for each patient. Each individual is assigned a dedicated personal physician and health coach, who maintain regular communication through various channels, including email, text, and video, in addition to in-person consultations. Iora Health employs a team-based approach that includes a doctor or nurse practitioner, nurse, behavioral health specialist, and health coach, all supported by a proprietary technology platform for effective population health management. The organization also provides educational programs, such as group visits, to assist patients in achieving their health goals and managing their overall well-being.

Nomad Health

Series B in 2018
Nomad Health, Inc. operates an online marketplace that connects healthcare professionals with freelance and permanent job opportunities in the United States. Founded in 2015 and based in New York, the platform allows doctors and nurses to search for positions by various criteria, including location and pay rate. By streamlining the healthcare staffing process, Nomad Health aims to simplify job searches for medical professionals and facilitate the hiring needs of healthcare facilities. This modern technology platform addresses the complexities of traditional healthcare staffing, promoting efficiency and accessibility in the job market.

Visterra

Series C in 2017
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Africa Healthcare Network

Venture Round in 2016
Africa Healthcare Network (AHN) has pioneered the first dialysis chain in Sub-Saharan Africa, aimed at delivering affordable, high-quality dialysis services for patients suffering from Acute Kidney Injury and End-Stage Renal Disease. In a region where existing facilities are limited and often charge exorbitant fees, AHN addresses the critical shortage of accessible dialysis care. The organization leverages its technical expertise and practical experience to establish well-equipped centers, while also focusing on training healthcare professionals to enhance service delivery. As Chronic Kidney Disease and related health issues rise due to urbanization and lifestyle changes, AHN's model prioritizes operational efficiency and cost-effective sourcing of medical supplies, thereby reducing treatment costs for patients. Operating in Rwanda, Tanzania, and Kenya, AHN is committed to increasing access to life-saving dialysis care, ultimately improving patient outcomes while ensuring financial sustainability.

Iora Health

Series D in 2016
Iora Health, Inc. is a healthcare provider based in Boston, Massachusetts, specializing in primary care services across the United States. Founded in 2010, the company is committed to overcoming the barriers typically present in the healthcare system by offering personalized care for each patient. Each individual is assigned a dedicated personal physician and health coach, who maintain regular communication through various channels, including email, text, and video, in addition to in-person consultations. Iora Health employs a team-based approach that includes a doctor or nurse practitioner, nurse, behavioral health specialist, and health coach, all supported by a proprietary technology platform for effective population health management. The organization also provides educational programs, such as group visits, to assist patients in achieving their health goals and managing their overall well-being.

US HealthVest

Series B in 2016
US HealthVest is an innovative behavioral healthcare firm that has redefined the psychiatric hospital space. De novo strategies and acquisitions of operating facilities with unrealized potential are the core of the US HealthVest business model. Each facility is structured to offer multiple service lines in order to serve the needs of specific patient population groups. The senior management team of US HealthVest has successfully built psychiatric hospital businesses which were acquired by public companies. Ascend Health was founded by Richard Kresch, M.D. in 2005 and was one of the largest private psychiatric hospital providers with nine freestanding facilities and nearly 900 beds. Ascend Health was sold to Universal Health Services (NYSE: UHS) in 2012. The predecessor company, Heartland Health Developments, also focused on psychiatric care and was sold to Psychiatric Solutions in 2004.

Visterra

Series C in 2016
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Iora Health

Series C in 2015
Iora Health, Inc. is a healthcare provider based in Boston, Massachusetts, specializing in primary care services across the United States. Founded in 2010, the company is committed to overcoming the barriers typically present in the healthcare system by offering personalized care for each patient. Each individual is assigned a dedicated personal physician and health coach, who maintain regular communication through various channels, including email, text, and video, in addition to in-person consultations. Iora Health employs a team-based approach that includes a doctor or nurse practitioner, nurse, behavioral health specialist, and health coach, all supported by a proprietary technology platform for effective population health management. The organization also provides educational programs, such as group visits, to assist patients in achieving their health goals and managing their overall well-being.

Visterra

Series B in 2014
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Strata Health

Venture Round in 2014
Strata Health leverages technology to achieve dramatic patient flow improvement within health systems. Our clients say they’ve entrusted us with the job of creating patient flow solutions that achieve real and dramatic benefits for patients, their families and the world’s devoted front line caregivers. Operational in Canada and the UK, Strata Health is a privately held Canadian corporation. It is comprised of professionals with empathy for those who need care and intense respect for those who devote themselves to caring for others.

Visterra

Series A in 2013
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Iora Health

Series B in 2013
Iora Health, Inc. is a healthcare provider based in Boston, Massachusetts, specializing in primary care services across the United States. Founded in 2010, the company is committed to overcoming the barriers typically present in the healthcare system by offering personalized care for each patient. Each individual is assigned a dedicated personal physician and health coach, who maintain regular communication through various channels, including email, text, and video, in addition to in-person consultations. Iora Health employs a team-based approach that includes a doctor or nurse practitioner, nurse, behavioral health specialist, and health coach, all supported by a proprietary technology platform for effective population health management. The organization also provides educational programs, such as group visits, to assist patients in achieving their health goals and managing their overall well-being.

US HealthVest

Series A in 2013
US HealthVest is an innovative behavioral healthcare firm that has redefined the psychiatric hospital space. De novo strategies and acquisitions of operating facilities with unrealized potential are the core of the US HealthVest business model. Each facility is structured to offer multiple service lines in order to serve the needs of specific patient population groups. The senior management team of US HealthVest has successfully built psychiatric hospital businesses which were acquired by public companies. Ascend Health was founded by Richard Kresch, M.D. in 2005 and was one of the largest private psychiatric hospital providers with nine freestanding facilities and nearly 900 beds. Ascend Health was sold to Universal Health Services (NYSE: UHS) in 2012. The predecessor company, Heartland Health Developments, also focused on psychiatric care and was sold to Psychiatric Solutions in 2004.

Visterra

Series A in 2012
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Visterra

Debt Financing in 2010
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Visterra

Seed Round in 2009
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

Visterra

Seed Round in 2008
Visterra, Inc. is a clinical-stage biopharmaceutical company focused on developing precision antibody-based treatments for difficult-to-treat diseases, particularly infectious diseases. Utilizing its Hierotope platform, Visterra designs monoclonal antibodies such as VIS410, aimed at treating hospitalized patients with influenza A, and VIS513 for Dengue fever. The company is also advancing VIS705, an antibody-drug conjugate for Pseudomonas aeruginosa infections, and VIS649, which targets Immunoglobulin A Nephropathy (IgAN). Founded in 2007 and based in Waltham, Massachusetts, Visterra was previously known as Parasol Therapeutics, Inc. The company operates as a subsidiary of Otsuka America, Inc. and emphasizes innovative therapeutic solutions to address significant unmet medical needs.

HealthCentral

Post in 2008
HealthCentral operates a network of over 30 websites focused on various health conditions, wellness, and general health topics, including allergy, bipolar disorder, cholesterol, and high blood pressure. These platforms offer users access to medical news, videos, and community interactions, as well as reputable resources like Harvard Health Publications. In addition to its online presence, HealthCentral produces the nationally syndicated television show "Medical Breakthroughs with Dr. Dean Edell." Founded in 1999 and based in Arlington, Virginia, HealthCentral was originally known as ChoiceMedia, Inc. The company has undergone significant investment changes since its acquisition in 2005 by various firms, including Polaris Venture Partners and The Carlyle Group, with a notable minority stake acquired by IAC. HealthCentral competes with other health information providers such as WebMD and RevolutionHealth.

Ascend Health

Series B in 2007
Ascend Health Corporation is a behavioral healthcare provider, offering a full range of inpatient and day hospital services to children, adolescents, adults and seniors. They focus on personal choice and specialized care. Their facilities provide high quality care by working closely to integrate their services with the healthcare system in each local community.

Esurg.com

Series B in 2000
Esurg.com, the most comprehensive and trusted online source for medical, surgical and pharmaceutical supplies and information. They designed Their Web site for the growing number of physician practices and clinics working outside traditional hospital settings — to give them an edge in the increasingly complex business of medicine.

Esurg.com

Series A in 1999
Esurg.com, the most comprehensive and trusted online source for medical, surgical and pharmaceutical supplies and information. They designed Their Web site for the growing number of physician practices and clinics working outside traditional hospital settings — to give them an edge in the increasingly complex business of medicine.
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