Hemsen graduated from Adelphi University with a BBA and MBA. Hemsen entered the USAF and was trained in ground support electronics. After his Honorable Discharge from the US Air Force, Hemsen worked in various positions of increasing responsibility, including 15 years in executive positions, in the merged or acquired business units of Honeywell International. These would include assignments in FRAM/Autolite, Bendix Corporation, Allied and AlliedSignal Corporations. Hemsen joined IBM in 1994 after nearly 25 years with Honeywell International. Hemsen’s industrial experience involved business units in Aerospace & Defense, Automotive OEM & Aftermarket Products, Chemicals & Specialty Materials and Information Technology & Services. He retired from IBM as Director of Human of Resources, Corporate Development, Mergers and Acquisitions.
Married and the father of two sons, Hemsen resides in New Jersey.