High Quality Content by WIKIPEDIA articles! Dr. Howard O. McMahon was Science Director, Vice President, Head of the Research and Development Division, and then President of Arthur D. Little, Inc, of Cambridge, Massachusetts, retiring from the Company in 1977. He made important contributions to the field of cryogenics as inventor, research scientist and engineer during the 1940s through the 1960s, and subsequently as an executive and member of the Board of Directors of both ADL and the Helix Technology Corporation, of Waltham, Massachusetts. McMahon, born in Alberta, Canada, was a naturalized citizen of the United States.