McMorrow was born in the Whitehouse section of Readington Township, New Jersey, and graduated from Hunterdon Central Regional High School.

[6][7] After graduation, McMorrow worked for design firms in New York and Los Angeles, as well as for Mattel and Gawker, before moving to Michigan.

[6][7] McMorrow participated in the 2017 Women's March in Detroit, and began writing postcards to Betsy DeVos, the U.S. Secretary of Education, challenging positions of the Trump administration.

[10] In January 2020, McMorrow, lobbyist Melissa Osborn and Michigan Advance reporter Allison Donahue accused Republican state Senator Peter Lucido of sexual harassment.

[13] In April 2022, Republican State Senator Lana Theis claimed in a campaign fundraising email that McMorrow wanted to "groom and sexualize kindergartners.

On August 19, 2024, McMorrow delivered a speech at the Democratic National Convention and brought out a giant copy of the roughly 900-page Project 2025.

[21] McMorrow supports expanding investment in renewable energy practices and funding clean water initiatives in her district.

[12] McMorrow married Ray Wert, the former head of Gawker's content sales department and editor of the weblog Jalopnik.