Mathew Weimer, MD, has been named president and CEO of Huntington, W.Va.-based Valley Health Systems after serving in the role on an interim basis.

DocGo has appointed Stephen Klasko, MD, as chair of its board of directors.

Monique Díaz, MD, will assume the role of vice president and regional chief medical information officer for CommonSpirit Health's California region, according to her LinkedIn. 

A Challenger, Gray & Christmas report published Sept. 26 showed that 12 hospital CEOs left their roles in August, down from 16 reported in the same month last year. Those exits spanned the U.S., according to data provided to Becker's by the executive coaching firm.

Becker's has reported on multiple CEO moves at California-based hospitals and health systems in September, including resignations and new appointments.

Sam Itani was named CEO of Shasta Regional Medical Center, a 226-bed facility in Redding, Calif.

Ballad Health and Niagara Falls Memorial Medical Center were among the hospitals and health systems that tapped new CFOs in September. 

Stacy Harberson has been appointed CEO of Nashville, Ark.-based Howard Memorial Hospital.

Jarrod Johnson has been appointed CEO of Birmingham, Ala.-based UAB Callahan Eye Hospital, effective Oct. 1.

Emory Healthcare has hired LeWanza Harris, MD, to serve as chief quality officer. 

Maimonides Health has appointed Eitan Dickman, MD, as chair of emergency medicine, a role in which he will oversee operations for three emergency departments in Brooklyn. 

Brian Marger has been named CEO of Nashville, Tenn.-based TriStar Skyline Medical Center, part of HCA Healthcare.

Mark Garvin became senior vice president for partnership and new venture development at Banner Health in Phoenix on Sept. 9.

Leslie Lawson has been named COO of South Charleston, W.Va.-based WVU Medicine Thomas Hospitals, effective Sept. 30.

Jackson-based West Tennessee Healthcare has promoted its COO to the top leadership role following the death of President and CEO James "JR" Ross, BSN.

Cory Ferrier has been named COO of AdventHealth Littleton (Colo.), effective Nov. 4.

Tina Burch, MSN, RN, was appointed CEO of Doctors Hospital of Manteca (Calif.), part of Dallas-based Tenet Healthcare, according to a Sept. 24 news release shared with Becker's.

Richie Splitt has stepped down from his role as CEO of Norman (Okla.) Regional Health System.

Orlando Health has named Shahidul Mannan as its new chief data, analytics and AI officer.

Columbus (Ind.) Regional Health's executive vice president and chief medical officer, Tom Sonderman, MD, plans to retire in 2025 after 35 years with the organization.