Who's behind stopwaroniran.org?

Received news this group is launching nationwide marches on cities in the US this weekend called Rally to Demand No War on Iran, US out of Iraq! and wanted to know if anyone knew who started this group and who is its backer? Address is in NYC.

 In addition, is there an online database of left wing groups like this that tracks or references sponsors of these obvious offshoots of bigger org's like ANSR, etc?