Holmes Hall, College of Engineering
Pi Tau Sigma is the National Honorary Mechanical Engineering Fraternity and is a member of the Association of College Honor Societies. With a total of 159 chapters installed over the past century, all but two currently maintain active status. There are chapters located at universities in almost every state in the United States.
The concept of Pi Tau Sigma was initiated simultaneously at the University of Illinois and the University of Wisconsin in 1915. A year later in 1916, Pi Tau Sigma was officially formed by these two schools. Purdue University and the University of Minnesota were then chartered in 1922 and has expanded to the 159 established chapters today. The Hawai'i Sigma Pi Chapter was chartered in January, 1969, as the 89th currently active chapter in the nation.