From Mark's obituary:
Sheehan, Mark L.
Horseheads: Age 64, passed away very unexpectedly on Saturday, June 2, 2012 in Brooksville FL doing what he loved. Mark was born in Elmira on February 3, 1948. He was a son of Mildred (Vesneske) Sheehan of Horseheads and the late Howard P. Sheehan. In addition to his mother, Mark is survived by his wife of 45 years Betty Long Sheehan; sons and daughter- in-law, Marc Sheehan, Rochester NY, Sean and Becky Sheehan, Spring Hill FL; grandchildren, Kiley, Brandon, Gavin, Emma, Brooke, Madilyn, Olivia and Bryn; sisters and brother-in-law, Paula and Francis Affeldt, Rock Steam NY, Donna Sheehan, Horseheads; brothers, Thomas Sheehan, Ocala FL and Dale Sheehan, Horseheads; brother-in-law and sister-in-law Edgar and Katy Wheeler, Thousand Oaks CA; along with several nieces, nephews, cousins, and all his good cycling friends. Mark was a U.S. Navy veteran serving from 1969 to 1971. He attended Corning Community College and Cornell University. Mark was recently retired from NYSEG with 37 years of service. He had a great love for life. Mark was an avid bicyclist who would spend hours riding with Betty and various cycling clubs. He was a member of the NRA and the Viper Club of America.