William R. Clark is a Visiting Professor with the Purdue University Davidson School of Chemical Engineering, and an Affiliate Professor with the University of Washington Mechanical Engineering Department. Dr. Clark was the Senior Medical Director of the Renal Therapeutic Area/Medical Affairs with Baxter Healthcare (2013-2016), the Vice President of Medical Affairs for Gambro Renal Products (2004-2013), Chief Medical Officer of NxStage Medical (2002-2004), and Director of Hemodialysis Research, Scientific Affairs/Renal Division of Baxter Healthcare (1994-2002).