›Portfolio Companies

Past, Present and Future Leaders

InterWest is proud and privileged to partner with visionary management teams who are shaping the future of Information Technology and Healthcare. The companies they have started are vital parts of the portfolio of industry-leading startups that InterWest has helped over the last four decades.

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467 First Street, Suite 201
Los Altos, CA 94022, USA
T: 650-854-8585
F: 650-854-4706

Early stage IT and Healthcare Investing

Arnie Oronsky


Managing Partner

"My years at InterWest have taught me that combining outstanding science with outstanding management is a formula for success—and that the greatest contribution I can make is to help life science entrepreneurs transform their ideas into profitable businesses with lasting value."

InterWest Team

Current Investments

Prior Investments

Arnie's bio

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Arnie has been a full-time member of InterWest's healthcare team since 1994. He is a board member of Centrexion TherapeuticsDynavax Technologies (DVAX), EpicentRxKalVista Pharmaceuticals (KALV), PMV Pharma, Prothex Pharmaceuticals, and Sera Prognostics.

As a Ph.D. in immunology and senior lecturer at the Department of Medicine at Johns Hopkins Medical School, Arnie brings a deep understanding of medical research to finding and investing in successful healthcare companies.

Prior to joining InterWest, Arnie was vice president for discovery research of the Lederle Laboratories division of American Cyanamid Company where he directed the research for new drugs.

Arnie received a Ph.D. in immunology from Columbia University and has published more than 125 articles in scientific journals.

Representiative Prior Investments

AkaRx (Acquired by Eisai Pharamaceuticals in 2009), Amplimmune (Acquired by Astrazeneca in 2013), Aspreva Pharmaceuticals (IPO 2006, ASPV, acquired by Galenica 2008), Corixa (IPO 1997, CRXA), Coulter Pharmaceuticals (Acquired by Corixa in 2000), Cubist (IPO 1996, CBST),  MacroGenics (IPO 2013, MGNX), Myogen (IPO 2003), Potenza Therapeutics (Acquired by Astellas in 2018),  Salmedix (Acquired by Cephalon in 2005), Signal Pharmaceuticals (Acquired by Celgene in 2000), Tesaro (IPO in 2012 TSRO, acquired by GSK in 2019).

I came to InterWest after leading a large research organization at Lederle Laboratories. It's one thing to understand the science and its potential, but quite a different challenge to turn that science into a profitable company that meets real market and health care needs. Through my years at InterWest, I have found that my greatest challenge and greatest achievement is to marry outstanding science to outstanding management in order to build a durable, successful company.

Arnie Oronsky

Information Technology

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