Irving Crespi was a public opinion pollster, professor, and market researcher long associated with The Gallup Organization. Crespi was also the author of books on polling, public opinion, and democracy. He earned his PhD from The New School for Social Research. He was associated with Gallup for a long period of time. He held subsequent research positions at Mathematical Policy Research, the Roper Organization, the Total Research Corp., and Irving Crespi & Associates. He also taught at Baruch College. He passed away in 2004.