Rep. Hornstein has served in the following leadership positions in the community:

Member/Co-Chair, Leadership Council, Clara Barton Open School

Parent Advisory Council, Minneapolis Public Schools

Block Club Leader, Linden Hills Neighborhood

Board of Directors/Vice-President, Linden Hills Co-op

Board of Directors, Progressive Minnesota and Board of Directors, Minnesota Alliance for Progressive Action (now TakeAction Minnesota)

Grants Committee, Headwaters Fund

Founding Board Member, The Green Institute

Founding Board Member, Organizing Apprenticeship Project

Founding Board Member, Wellstone Alliance

Board Member, Jewish Community Relations Council of Minnesota and the Dakotas

Named one of "100 People to Watch" by Minneapolis-St. Paul Magazine, February 2000