Following is the obituary for STEWART H. GREENFIELD, submitted for the family by the Abraham L. Green and Son Funeral Home in Fairfield.

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Stewart H. Greenfield, 91, of Westport, passed away on July 19, 2023, in Bridgeport Hospital.

Stewart was born in Brooklyn to Milton and Gertrude Greenfield. He earned a bachelor’s degree from St. John’s College in Annapolis, where he was an extremely loyal alumnus. He served honorably in the U.S. Army from 1953 to 1955. 

He worked at IBM and Sprout Ventures and then co-founded two investment businesses, Oak Investment Partners, where he worked from 1978 to 1994, and Alternative Investment Group, where he worked from 1996 to 2020, when he finally retired at age 88. 

He had a passionate love of birdwatching and hiking, and a deep desire to make the world a better place. 

He served on the boards of St. John’s College and the Santa Fe Institute and was an active donor and fundraiser for the Nature Conservancy and many other educational, environmental and human rights nonprofits, as well as a significant contributor and fundraiser for Democratic politicians. 

He helped start and fund several early climate technology investment funds, and was a pioneer in making business more socially impactful and more equitable. At one point in the 1980s, 50 percent of the female partners in the National Venture Capital Association worked for Oak Investment Partners.

The Connecticut League of Conservation Voters named him the 2017 Founders Award as a lifelong environmental champion. He was a former board leader of the Connecticut League of Conservation Voters Education Fund, a trustee emeritus of the Nature Conservancy of Connecticut, and served on the boards of Devil’s Den and Earthplace, among many others. 

Stewart is survived by his wife, Constance Greenfield, of Westport; his son, Matthew Greenfield, and wife, Molly Jong-Fast; their children, Max, Beatrice and Darwin; his daughter, Joanna Greenfield; his son, Roger Comora, and his children, Isabelle and Lucas, and his extended loving family. He was predeceased by his beloved mother, Gertrude, and father, Milton; stepmother, Minerva; deeply loved sister and brother, Lesley and Michael, and nephew, Howard. 

Funeral services will be held on Sunday, July 23, at 12:30 p.m. at the Abraham L. Green and Son Funeral Home, 88 Beach Road, Fairfield. Per the family’s request, casual attire, a negative COVID test and face masks are required for attendance. Burial will follow at Temple Israel Cemetery, 225 Richards Ave., Norwalk. For more information, to join a livestream and to share a condolence message, visit www.greensfuneralhome.com. Please send photos and videos for a slideshow to info@greensfuneralhome.com.

Memorial contributions, in lieu of flowers, may be made to the Nature Conservancy or St. John’s College in Annapolis. 

The family wishes to extend their gratitude to the many organizations that gave him joy, and multiple caregivers, family members and friends who supported him.