The company lists Doerr as the principal owner and backer. Doerr is a partner at Kleiner Perkins Caufield & Byers, while Long is the former CEO of Healtheon. Doerr also led Purkinje’s US $11 million third round round in March 2005. The company has now raised a total of $27 million.
Update: As someone points out below, John Doerr’s brother, Thomas, is chief medical officer at the company.