LOS ANGELES (AP) — A trail of red flags about his behavior toward women followed Matthew Harris on an academic journey that took him to three of the nation's most prestigious universities — Duke, Cornell and then the University of California, Los Angeles.

Former graduate classmates at Duke and Cornell, where he studied before becoming a postdoctoral fellow at UCLA in recent years, described him as inappropriate and creepy, with obsessive behaviors like sending excessive emails and text messages to some women that became harassment and, in at least one case, sexual harassment. Another said she...