He helped revitalize the Pi Lambda Phi fraternity by founding the NY Alpha chapter.
[1] While practicing as a dentist, Jagendorf's interests remained in the folklore of Europe, Asia, and the United States.
[2] He wrote for Hippolyte Havel's Revolt and co-edited The Road to Freedom with Harry Kelly.
He helped to found the Free Theatre, was director of the Children's Playhouse, and was active in the following organizations: Mohegan Colony Association, Story League, Green Room Club, The International Composers' Guild (he was Edgard Varèse's dentist), Overseas Press and the New York Folktale Society.
He also wrote a book on making wines and other beverages: Folk Wines, Cordials & Brandies: How to Make Them, Along with the Pleasures of Their Lore, Publisher: Vanguard Pr Date Published: 6/1/1963 ISBN 978-0-8149-0125-0 ISBN 0814901255 He was mentioned at the end of S01E06 (originally broadcast 22 March 1998) of the British comedy series This Morning With Richard Not Judy in an installment of the running joke Men of Achievement 1974.