Dr. Steffen Nock to the position of acting Chief Executive Officer. Dr. Nock is currently President of Arana Therapeutics Inc based in San Francisco. He holds a Ph.D. in biochemistry from Bayreuth University, Germany. Prior to joining Arana, he has held senior positions with biotechnology companies Evogenix, Absalus, and Zyomyx as well as a research position at Stanford University, USA.