BIOQUAL announced the retirement of John C. Landon as Chief Executive Officer. Effective June 3, 2013, Dr. Mark G. Lewis was appointed to succeed Dr. Landon as CEO. BIOQUAL's Board of Directors had appointed Dr. Lewis as BIOQUAL's President on November 15, 2010, based in part on the belief that Dr. Lewis would be a strong candidate as a successor CEO.

Dr. Landon will also retire as an employee of BIOQUAL on August 14, 2013, but will continue as Chairman of the BIOQUAL Board of Directors. Dr. Lewis joined BIOQUAL as Senior Scientist in August 2003. He became the Executive Vice President in October 2008, and served in that capacity until he became President in 2010.