The biggest issue for those living in Shelter Island, Colligan said, is the quality and quantity of water for residents. He said that since the two storms, Sandy and Irene, residents with homes in low-lying areas have experienced saline intrusion into their wells. "We have to do a better job to try to rectify it." The second large issue is the tick problem. He said that town should do more culling of the herds there because fewer deer means fewer ticks, adding that the residents also complain about deer eating vegetation, including new sapling growth. Colligan, a self-described outdoorsman, has Lyme disease. He also sits on the town's Deer and Tick Committee. Two other issues, helicopter noise and infrastructure of the roads, are also on his agenda.
Colligan, 68, a registered Democrat, is running on the Democratic line. A 9-year resident of Shelter Island, he is a retired director of health, physical education, recreation and athletics at the Carle Place School District. Colligan received his bachelor's degree in 1969 from Niagara University, a master's degree in health education from Adelphi University in 1975, and an advanced degree in school administration in 1979 from Hofstra University. He is also a Vietnam War and Desert Storm veteran, having served three years in active duty and 23 years in the Army Reserve. He and his wife have three children.