GALVESTON — The University of Texas Medical Branch announced Tuesday an interim replacement for William R. Elger, the highly regarded CFO who resigned after an investigation into topics that university lawyers argued were too sordid for public disclosure.  <br /><br />Michael Scheer, a Certified Public Accountant with extensive experience as a financial executive in health care, is to join the organization today as interim chief financial officer, Dr. David Callender, medical branch president and CEO, said Tuesday in a written statement.