Milli's interest in public historic gardens began when she volunteered for the Landmark Society's Ellwanger Garden restoration in the mid 1980's. The culmination of that interest is the ongoing rehabilitation of the Warner Castle Estate Gardens, a unique component of Highland Park; she has spearheaded the project since its beginnings in 2012. Currently she is also working on the Conservancy’s Garden Volunteers Committee. She served on the Board of Trustees of the Rochester Civil Garden Center for 5 years and is a long-time member of the Landmark Society of Western New York. She has owned and operated Perennial Designs, her garden design and maintenance business, for 22 years. A graduate of RIT, she has also worked in multiple aspects of the graphic arts and printing industries.