The original by-laws were ratified and became effective upon ratification by one-third of the Members of the Association present at the annual meeting of the Association held on December 29, 1963, in Chicago, Illinois at The Palmer House.

The original By-laws were amended on July 15,1996 and, by majority vote of a quorum of the Members of the Association conducted by mail ballot, were further amended on June 15, 2001, and March 30, 2007.