Garrett Lam will join Sera Prognostics as chief medical officer starting Sept. 4. He will direct all clinical development activities for the firm and direct a group of clinical operations professionals in support of the firm's collaborations. Lam is currently a professor and chairman of obstetrics and gynecology at the University of Tennessee College of Medicine-Chattanooga. Lam replaces Durlin Hickok, who has been Sera's CMO since 2011. Hickok will continue as an advisor to Sera.