Neville Sassienie spent his life moving between worlds, as an environmental activist, a seeker of spiritual truth, and a leader in the Jewish community. He died on June 15 in a village near London. He was 91.

An accountant by profession, his interest in personal development led him to become involved in the Landmark Forum, an organization offering training in personal and professional growth. Eventually, he became aware that “personal spirituality and collective social and environmental transformation went hand in hand,” The Guardian said.

He was active in the Jewish Board of Deputies and fought to raise awareness in the Jewish community of the need to care for the environment, leading to the launch in 2007 of the Big Green Jewish Website, which was a major influence in addressing the issue he cared so passionately about.