Clay Siegall

Clay B. Siegall, Ph.D., co-founded Seattle Genetics in 1998 and is the company's President, Chief Executive Officer and Chairman of the Board. A scientist by training with an emphasis on targeted cancer therapies, Dr. Siegall built Seattle Genetics on a foundation of scientific innovation, rigorous research and drug development practices as well as a passion for helping patients. He has guided the company to its current leadership position in developing antibody-drug conjugates (ADCs) for the treatment of cancer.

Under Dr. Siegall’s leadership, Seattle Genetics has entered into multiple strategic licenses for its ADC technology, including with Genentech (Roche), AbbVie, GlaxoSmithKline and Pfizer, that have generated more than $300 million to date. Across internal and collaborator programs, there are more than 20 ADCs in clinical development using Seattle Genetics’ technology. Dr. Siegall has also led Seattle Genetics’ capital-raising activities, securing more than $675 million through public and private financings, including the company’s initial public offering in 2001.