A former Michigan State University professor sexually harassed two of his students, according to an explosive new investigative report by the school.

William Jacoby, a retired political science professor, sexually harassed graduate students at both the University of Michigan and MSU, the Lansing State Journal reported, citing the unreleased report.

A graduate student at MSU, whose name was redacted in the report, asked Jacoby to help her with a research project and, she said, he aggressively responded, “What are you going to give me?” She added that she would be grateful and he responded: “You can’t expect me to do something for nothing, quid pro quo.” The student told university investigators that his response sounded like a “sexual ask.”

“I felt like he was asking me for (oral sex) or something,” she told investigators.

Jacoby retired from Michigan State University on Jan. 1.

A spokesperson from MSU told The Post that while there was a finding related to the allegations in the university’s internal probe, no actions would be taken against Jacoby until the conclusion of an appeal process.

The other alleged incident of sexual harassment took place in 2002.

Rebecca Gill, then an MSU graduate student who was taking part in a political research summer program at the University of Michigan, claims the professor made uncomfortable remarks toward her at a bar in Ann Arbor.

Gill told The Post that Jacoby commented on how “good looking” she was and asked her to consider having an affair with him. A friend who overheard the encounter told Gill that they should leave and later corroborated Gill’s claim to university investigators.

Gill said the interaction left her feeling dejected and put her in a tough place for proceeding with her dissertation. She said when time came to defend her dissertation, Jacoby’s wife, Saundra Schneider, who was the director of graduate studies at MSU, had a policy of only signing off on politics students if they included her husband on their committee.

Gill met with Jacoby to ask him to not be on her dissertation committee due to their previous encounter. She said Jacoby denied propositioning her and refused to make concessions for her.

Concerned that she could not graduate under the circumstances, Gill delayed defending her dissertation until two years later when Jacoby’s wife was no longer the graduate director.

Although Gill did not report Jacoby to the university at the time, she did tell two professors whom she claims never reported the incident to the school’s Title IX office. She said she did not report him to higher-ups at the university in fear that they could ruin her reputation and torpedo her career.

Years later, Gill finally shared her story on a panel about mentorship at the 2018 Southern Political Science Conference. Although she did not use his name, Jacoby, who was also an editor at the The American Journal of Political Science, posted a letter on the journal’s site denying the sexual harassment allegations.

Jacoby was later forced to remove the post and stepped down as the editor, the Lansing State Journal reported.

Gill is now a director of the Women’s Research Institute of Nevada and associate professor of political science at the University of Nevada in Las Vegas.

An investigation by the University of Michigan concluded that Jacoby “engaged in behavior that violated the university’s sexual harassment policy.” The university would not confirm or comment on the investigation when reached by The Post.