SHAWNEE, Okla. — Oklahoma Baptist University (OBU) trustees accepted the retirement of OBU President Mark A. Brister during a special meeting Oct. 12 on the university’s campus in Shawnee. Brister, who will retire effective Nov. 10 at the conclusion of OBU’s annual homecoming, has led the Christian liberal arts institution since Sept. 1, 1998. "The time has come for me…