A New York woman who has suffered a lifetime of grief — losing her husband on 9/11 and only child to suicide on Valentine’s Day 2017 — is trying to ban from all classrooms the professor who left her daughter heartbroken and distraught.

Marcia Weiss has written to more than 200 colleges to say that Adam Joyce violated the sexual misconduct policy at Hunter College by having a relationship with a student — her daughter Gina.

“I have decided to personally put every college and university in the tri-state area (as well as in California) on notice of this violation,” she writes in her letters. “The reason is that there is no guarantee that this information will be disclosed to a potential future employer and it is a widely held view that persons who engage in this type of behavior tend to repeat it.”

But Joyce has already managed to slip through the cracks. He landed a teaching job at a Connecticut college after the school failed to heed Weiss’ warning and he omitted his lurid past from his resume.

Gina Weiss met him while a student in a Hunter honors program. The affair between Gina and Joyce began in January 2016 when she was in his political science class. She was 22 and he was a 45-year-old married father of two.

Weiss said her daughter, though brilliant, had recurring PTSD after the Sept. 11, 2001, terrorist attacks.

Gina was 7 and living in Greenwich Village with her family when she witnessed the Twin Towers burning. She knew her father, David Weiss, the deputy general counsel for Cantor Fitzgerald, worked on the 104th floor.

After Gina’s death, Weiss uncovered hundreds of emails her daughter and Joyce had exchanged professing their love for one another.

In one March 2016 missive, Joyce writes to Gina, “You’re consuming my thoughts, time and for f–k’s sake body. As I said, I’m f–king lech. I fell for your mind and how you relate to me as a soul who makes connections that I want to make. … I’m fully capable of lust. Even when it’s completely inappropriate. Which is basically always.”

The romantic relationship ended in May 2016, although the two stayed in constant touch, Weiss said.

“She was not emotionally equipped to deal with anything at the level of intensity that this was — including being rejected,” Weiss said.

Hunter opened a probe after Gina’s death when Weiss informed them of the relationship. Joyce quit before it was concluded.

Hunter College president Jennifer Raab wrote Weiss in June 2017 saying “the evidence supports the allegation that Mr. Joyce engaged in an intimate relationship in violation of CUNY’s sexual misconduct policy.”

Joyce was informed by Hunter in a letter seen by The Post that he would be barred from working at any CUNY school and that “your employment record will reflect that you resigned pending an ongoing legal investigation.”

But when Joyce applied for a job at Western Connecticut State University in Danbury he left Hunter off his resume and the school office that received Weiss’ warning letter never sent it to the hiring department, according to a school spokesman.

Joyce taught two classes there in Fall 2018.

A lawyer for Joyce said he would not comment.

Weiss said she would like to see a central registry of professors who have violated sexual misconduct policies.

“It’s just a complete absence of vetting, which has allowed these people to move and continue to move and nobody is taking any action that I’m aware of to make it safer,” she said. “Because, honestly, all 20 year olds are vulnerable.”

Joyce joined Hunter College in 2015, among an army of adjuncts teaching in the public City University of New York system, some of them barely vetted.