ThermoGenesis Corp. announced that Matthew Plavan, currently Chief Financial Officer and Executive Vice President, Business Development, will become Chief Executive Officer and a member of the Board of Directors, while retaining his position as the company's Chief Financial Officer. Plavan has served as Chief Financial Officer since 2005 and served as Chief Operating Officer from 2008-2010. Plavan replaces J. Melville Engle, who has retired from his position as Chairman and Chief Executive Officer. Engle joined the company as Chief Executive Officer in 2009 and was named Chairman of the Board in 2010.