katz served as chairman of the board of the “volunteer center of israel” from 1986 until 1989, and of the “voluntary and nonprofit sector” – a roof organization of the volunteer center and other nonprofit organizations between 1988 and 1989. during the 1980s and 1990s he served as a trustee and member of the board of several nonprofit sector organizations and worked for the establishment of groundwork for research on the third sector and its role in the modern welfare state.