On Wednesday, November 5, 2025, David G. Sleeper peacefully passed away. David was born in Portland, ME. While growing up in a quiet, Cape Elizabeth neighborhood, his creative tendencies were beginning to show. Prior to 6th grade, he figured out how to tap the telephone system and listen to others making calls. Before attending college, he rescued a 1913 Model T from his great uncle Rob's garage and had it running shortly after. Many similar events involving David and his circle of like minded friends followed — not always with parental approval. David attended high school at Holderness School in Plymouth, NH, and completed his formal education at Boston University.

After several years of employment at Scott Paper Company's Specialty Paper division in Westbrook, ME, David decided that self-employment would provide better opportunities. His efforts resulted in the creation of several businesses. First came designing, manufacturing, and installing solar-thermal heating systems for cabins and small homes. David's success led to the creation of Brook Farm Labs, an expansion into the photovoltaic-diesel generator arena, providing custom, stand-alone systems to meet the challenges of bringing power to remote locations.

Initial funding for Brook Farms Labs came, in part, from his service guiding tours throughout Casco Bay. Combining his commercial marine license and the 45 foot charter vessel the Freeman Clark, David provided customers with the experience of participating in a true Maine clambake. While underway or on a remote island beach, small groups would enjoy a lobster dinner, which included his famous clam chowder.

After 1996, David relocated Brook Farm Labs to Isleboro, ME where he also became the Harbor Master, as well as continued his role as a licensed Professional Engineer in the Army Corp of Engineers. Retiring in 2017, David moved to Florida 2 years later.

David will be remembered for his incredible creativity, his leadership, and his success as an entrepreneur. With his passing, David leaves behind his longtime partner, Alice Fay (Placida, FL), brother, Arthur Sleeper (Draper UT), a niece and nephews living in Brooklyn NY, Cincinnati OH, and Sacramento CA.

We would like to extend our gratitude to the staff of Discovery Commons Senior Living Center in Bradenton, FL and Tidewell Hospice, Bradenton who cared for David during challenging times.