Roger Ellis Millsap (November 18, 1954 – May 9, 2014) was an American psychometrician known for his research on measurement invariance.
[1] He received his BS degree from the University of Washington in 1977, followed by an MA in statistics and a PhD in quantitative psychology.
He received both of his advanced degrees in 1983 from the University of California, Berkeley, where he was supervised by Bill Meredith.
[3][4] After receiving his PhD, Millsap taught industrial/organizational psychology at Baruch College until 1997, where he eventually became a full professor.
In 1997, he joined the quantitive psychology faculty of Arizona State University, where he taught until his death in 2014.