Weiser and partner Andrew Deppe have volunteered for and supported LGBT religious, sports and political causes for many years. Weiser was a key early leader in Frontrunners/Frontwalkers of Chicago. He co-founded Frontrunners with the late Peg Grey and two others. He initiated the tradition of Tuesday and Saturday after-run breakfasts for the group. He has also supported Congregation Or Chadash (he has been a member since 1980 and a board member around 1999-2005 and co-president 2004-2005), Lambda Legal, and Center on Halsted. He is Assistant General Counsel with Blue Cross Blue Shield of Illinois.