CAMBRIDGE, Mass., May 31, 2012 (GLOBE NEWSWIRE) -- Merrimack Pharmaceuticals, Inc. (Nasdaq:MACK - News) today announced that Robert Mulroy, President and Chief Executive Officer, is scheduled to present at the Jefferies 2012 Global Healthcare Conference on Tuesday, June 5, 2012 at 11:00 a.m. (EDT) at the Grand Hyatt in New York, New York.