Greenberg was a Web 1.0 pioneer. In 1996 he started Gist Communications, a disruptive new media company that competed successfully with News Corp’s TV Guide Online. In 1997, Gist was one of just 14 websites in the world to be named a winner of the First Annual Webby Awards in San Francisco. At Gist, Jonathan managed a staff of 80 technology and editorial staffers to implement custom TV listings and daily entertainment news for millions of direct viewers, as well as client-customized applications in three countries for Yahoo, AOL, MSN, NBC, CBS, USA Today, CNN, Axel Springer, Hachette Lagardere and Hewlett Packard.

Greenberg is also an award-winning national investigative financial and legal journalist who wrote four of the most widely-read exposes about Donald Trump’s business career to be published in the Washington Post. Greenberg’s story of his early career as the Forbes 400 reporter who taped Trump pretending to be the fictitious John Baron has been the subject of monologues on Colbert, the Daily Show and Seth Meyer’s A Closer Look.

During the two years following the World Trade Center attacks of September 11, Greenberg served as Policy Director for the New York City Council’s Select Committee on Lower Manhattan Redevelopment, where he directed media and public policy campaigns and was the city council’s lead analyst for federal relief programs.

Jonathan is the founder and CEO of Progressive Source Communications, which  helps select nonprofits and advocacy groups directly build public awareness through people-powered digital media campaigns.  The company has created campaigns featuring strategic new narratives, web videos, petitions, and websites for organizations including the ACLU, the Lakota People’s Law Project, Stonyfield Farm, the Virgin Foundation, SHAKA Movement, Physicians for a National Health Program, Solar Cookers International, Stop All Government Evictions from Safe Affordable Alternative Housing (SAGE), Bury Fire-Causing Power Lines Now!, Restore Library Hours and Stop Incarcerating Parents for Victimless Marijuana Crimes.

Progressive Source also owns the SonomaIndependent.org, a 7-year old award-winning public interest solutions and advocacy website.

Jonathan received his B.A. in rhetoric and literature from the State University of New York at Binghamton and a Masters Studies in Law degree from Yale Law School.