Thomas F. Ackerman, corporate executive vice president and chief financial officer, will retire from Charles River Laboratories in February 2016. David R. Smith, corporate senior vice president, Global Discovery Services, will succeed Mr. Ackerman.   Mr. Ackerman joined the company in 1988 has held his current position since 2005. Mr. Ackerman has agreed to provide periodic consulting services during the one-year period following his retirement, allowing for a smooth transition.   Mr. Smith join...