Cogent HMG, the hospital medicine and critical care medicine provider, named John J. Donahue as its new CEO, effective Jan. 3. Donahue succeeds Stephen L. Houff, MD, who founded Hospitalists Management Group HMG and has led the efforts to merge Cogent Healthcare and HMG. Houff will now serve as chairman of Cogent HMG. Gene Fleming, former CEO of Cogent Healthcare, will be leaving his full-time post of Chairman of the Cogent HMG Board of Directors and will continue as an investor and member of the board.