John D. Sinnock ’85 Posted on October 19, 1989January 4, 2015 by Alpha Tau Omega - Gamma Zeta Chapter John D. Sinnock ’85 joined the chapter eternal October 19, 1989. While studying at the University of Illinois he served as president of ATO, showing great leadership, and won several fraternity awards of great distinction. Read a tribute to his life here. Spread the love. Share this post! Posted in ATO Alumni News, Chapter Eternal.