Willem P. C. Stemmer

Avidia, Inc. developed pharmaceutical products. The company developed a novel, proprietary class of small therapeutic proteins. The company was headquartered in Mountain View, CA.

Amunix Pharmaceuticals, Inc. manufactures and fabricates drugs. The firm’s pipeline products are based on proprietary XTEN half-life extension, Antibody-XTEN-Drug Conjugate, ProTIA pro-drug and bispecific T-cell engager platform technologies. The company was founded by Willem P.C. Stemmer and Volker Schellenberger in 2006 and is headquartered in Mountain View, CA.

Maxygen, Inc. is a biotechnology company. It is focused on the potential further development of its MAXY-G34 product, a next-generation pegylated, granulocyte colony stimulating factor, G-CSF, for the treatment of chemotherapy induced neutropenia and acute radiation syndrome. G-CSF is a natural protein that functions by stimulating the body's bone marrow to produce more white blood cells. The company was founded on May 7, 1996 and is headquartered in San Mateo, CA.

Hybritech, Inc. provides prostate diagnostic testing services. The company is headquartered in San Diego, CA.

Amunix, Inc. develops protein pharmaceuticals. It offers XTEN which is hydrophilic, unstructured, biodegradable polypeptides that impart a number of favorable properties upon the molecules to which they are attached. The company was founded by Volker Schellenberger and Willem Stemmer in 2006 and is headquartered in Mountain View, CA.

Versartis, Inc. is an endocrine-focused biopharmaceutical company, which engages in the research and development of pharmaceutical products. Its portfolio includes Somavartan and XTEN TEchnology which target the endocrine disorders and growth hormone deficiencies. The company was founded by Jeffrey L. Cleland, Mark de Boer, Willem Stemmer, Volker Schellenberger, and Joshua Silverman on December 10, 2008 and is headquartered in Menlo Park, CA.