The Seder Ritual Committee was founded in 1952 by the American Jewish Congress and lead by the historian Israel Goldberg (Rufus Learsi). The task of the committee was to compose a prayer memorializing the suffering and persecution of the Holocaust. The Seder Ritual of Remembrance, the prayer they composed, was broadly distributed to various Jewish organizations, press, and synagogues.
Source: A. Katz, “Supplement: The Seder Ritual of Remembrance,” Beurei Hatefila 7, no. 28 (2010), http://www.beureihatefila.com/files/Seder_Ritual_Of_Remembrance2.pdf
From the guide to the Seder Ritual Committee Records, undated, 1952-1969, (American Jewish Historical Society)