who is the hospital administrator or manager ie. person in charge

Each clinic has their own chief, sometimes a commissioned officer and sometimes a civilian. Like charles said though, that's the director and commanding officer. There's also a command suite with directors and executives.

Dr. Robert Buckley (director) Captain Thomas Nelson (deputy director & Commanding Officer) All leadership information can be found at https://www.lovell.fhcc.va.gov/about/leadership.asp I hope this was helpful!