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Groups Archives: Staff

Janna Siller

Janna Siller   Farm Director and Advocacy Coordinator

Janna wears a few hats at Hazon. As the Adamah Farm Director, Janna leads apprentices, residential fellows, and volunteers in growing organic vegetables for the Isabella Freedman Jewish Retreat Center, local customers, and food banks while maintaining the fields as resonant learning space. She teaches about growing food, climate change, policy, food systems, and Jewish tradition. As Hazon’s advocacy coordinator, Janna leads grassroots efforts to raise Jewish voices on behalf of a more just and regenerative food system. Janna has been farming since 2005 and has been at Adamah since 2011. Physical work with community and in the soil informs and inspires her approach as an advocate and educator.

Falls Village, CT | janna.siller@hazon.org
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David Rendsburg

David Rendsburg   Chief Finance & Administration Officer

David Rendsburg is currently the Budget Director at Hazon, and the incoming Chief Finance and Administration Officer, supporting all departments with number-crunching. Originally from Binghamton, NY, he graduated from the University of Pennsylvania in 2004 with a degree in Jewish Studies, and spent time living and learning in Israel as well. David has held many roles since joining Hazon in 2006, including Director of Bicycle Rides and Director of Data and Analytics. He has participated in or staffed over 40 bicycle rides with Hazon and has attended many holiday retreats at Isabella Freedman. After 15 years in New York City, David moved to Philadelphia in 2020 with his wife and two children.

Philadelphia, PA | 212.644.2332 x302 | david.rendsburg@hazon.org
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Becky O’Brien

Becky O'Brien   Director of Food & Climate

Becky O’Brien is Hazon’s Director of Food & Climate. Prior to that, she was Hazon’s Director of Boulder for nearly 9 years. She has worked in the nonprofit sector for more than 20 years. She is passionate about Hazon’s mission and brings to her work her experience in project management, volunteer coordinating, programming, advocacy, fundraising, communications, and nonprofit administration. She received a Bachelor’s Degree in Religious Studies from the University of South Florida and a Master’s Degree in Religious Studies from the University of Colorado. She enjoys spending time with her family, hiking and camping in the beautiful Colorado outdoors, knitting, and volunteering to make the world a better place.

Boulder, CO | 303.886.5865 | becky.o'brien@hazon.org
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Nigel Savage

Nigel Savage   Founder & Former CEO

Nigel Savage founded Hazon, the Jewish lab for sustainability, in 2000. He served as its CEO for 21 years, stepping down in July 2021.

Under his leadership, Hazon became the largest environmental organization in the American Jewish community.

Hazon was one of only two groups to have been in every single Slingshot guide, and was recognized by the Sierra Club as one of 50 leading faith-based environmental organizations.

Nigel has been a popular teacher and speaker in a wide range of venues.
In recognition for his work, in 2015 he was awarded an honorary doctorate by the Jewish Theological Seminary. He has twice been named a member of the Forward 50, the annual list of the 50 most influential Jewish people in the United States. He is a recipient of the Bernard Reisman Award, and has given Commencement speeches at Wagner (NYU, in 2011), at Hornstein (Brandeis, in 2014) and at Spertus (in Chicago, in 2018).

Before founding Hazon, Nigel worked in asset management in London for NM Rothschild and as co-head of UK Equities at Govett. He has an MA in History from Georgetown, and has learned at Pardes, Yakar, and the Hebrew University. He was a founder of Limmud NY.

Nigel executive produced the British independent movies Solitaire For 2 and Stiff Upper Lips and had an acclaimed cameo appearance in the cult Anglo-Jewish comic movie, Leon The Pig Farmer. He is believed to be the first English Jew to have cycled across South Dakota on a recumbent bike.

New York, NY
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