U.S. Legal Support Inc., a Houston-based firm that provides legal staffing and other services, named Steven Drexel as CFO. Drexel had served as president and CEO of CSG Holdings, a subsidiary of Impellam Group PLC that included Corestaff. Drexel left Impellam in January 2009. Immediately prior to joining U.S. Legal Support, Drexel had served as chief operating officer of Ameristem Inc., a biotech company offering adult stem cell-based therapies.