Democratic Left, September 1991, page 36
In 1990 Mark Finkel, Chair Nassau DSA, placed an ad in the Democratic Socialists of America magazine Democratic Left, September/October, 1990, page 23, "In memory of Natalie Fleischman and Paul Gutierrez".
Democratic Socialists of America
In 1997, Mark Finkel was the Nassau contact for Democratic Socialists of America.
Religion & Socialism Commission
In 2000, the Democratic Socialists of America Religion & Socialism Commission consisted of;
Co-Chairs: Rod Ryon, Juanita Webster
Secretary: Maxine Phillips
Treasurer: John Cort
Executive Committee: Judith Deutsch, John Endler, Norm Faramelli, Mark Finkel, Andrew Hammer, Tharen Robson.
In 2009 REP-LI board of directors of Research & Education Project of Long Island-the non profit wing of Long Island Progressive Coalition consisted of;
Arlene Baum, Treasurer; Dr. Joan Beder, Laurel Coston, Co-Chair; Lyn Dobrin, Professor James Edwards, Mark Finkel, Gordon Greenfield, Rosanne Helden, MSW; Stephen Helden, Co-Chair; Dr. Jeffrey Isaac, Professor Steven Kraft, MSW;, Daniel Sprintzen, Dr. David Sprintzen.
In 2001 Mark Finkel was Long Island contact for New York City Democratic Socialists of America.
In 2009 Mark Finkel was Nassau County contact for Democratic Socialists of America.