Mr. Tarver told his colleagues in the Augusta delegation this morning that he learned the news in a conversation he had last night with the chancellor of the University System of Georgia that governs MCG. A formal announcement is expected later today.
Dr. Rahn will remain in his post until October, seeing his daughter through a planned wedding, according to the senator. The timetable will prevent the need for an interim president to be appointed since it gives a search committee time to find a permanent replacement, Mr. Tarver said.
The Arkansas school is slightly bigger than MCG, with a little more research funding and more employees.
Last month, Dr. Rahn -- MCG president since 2001 -- said he was one of four finalists for the post.
"I was contacted and asked to take a preliminary look," he told The Chronicle. "And based upon what I saw, I'm impressed with the institution and I agreed to be a candidate."
The position is actually chancellor of the school, but it is the equivalent of a school president who reports to the president of the system. The current chancellor, I. Dodd Wilson, retires June 30.
Dr. Rahn insisted in February he was not unhappy with MCG.
"This is not about something wrong at MCG," he said. "I've always said that I'm very proud of MCG -- and I am -- and to have the role that I have."