Before serving as Horticulturist of Haskell Public Gardens, Mc Cullin was the Senior Horticulturalist at The Native Plant Trusts Garden in the Woods. Prior to that, McCullin was selected as a Garden Club of America and Royal Society of Horticulture Scholar to intern at a variety of important public gardens in the UK. She also served as an apprentice at Harvard University’s Arnold Arboretum in Boston, and as a Landscape Coordinator at the Central Park Conservancy in New York City. McCullin has a Bachelor of Science in Landscape Architecture from the University of Massachusetts, Amherst. She lives in Acushnet, Massachusetts with her horticulturist husband Nate and their daughter Kalmia.