Shephard contributed to the US during the Spanish/American War and towards Military hospital supplies. She donated the building for the New York University Library and made donations to colleges, the YMCA, YWCA and other organisations. She sat on the board of the YWCA, the Russell Sage Foundation and (with Emma Baker Kennedy) was one of the first female vice presidents of the American Bible Society. She was worked for the Women's National War Relief Association.
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Interesting that I couldn't find much online to fill in the details of Shepard's work, and that she's described as a "Socialite" rather than a reformer - another woman set to fade out of history perhaps? If anyone has any information about Helen Shephard I hope you'll get in touch.