Lauren Johnson, 52, alleged in a lawsuit that her former boss Jack Essig "regularly mocked" older employees and female workers while she worked there from 2016-2018.
A Hearst Magazines spokesperson said it investigated the allegations and believes the lawsuit has no merit.
WPP sold 60% of Kantar to Bain Capital in 2019 in a deal that valued it at $4 billion.
"Like many companies, Kantar has felt the economic impact of the Covid-19 pandemic. We are making changes to our business now, unfortunately including redundancies, to ensure we rebound in a stronger position, capable of sustainable growth," a spokesman said.
In a testimony before the House Consumer Protection and Commerce Subcommittee published Thursday, Kendall accused Facebook of building algorithms that have facilitated the spread of misinformation, encouraged divisive rhetoric, and laid the groundwork for a "mental health crisis."
At the subcommittee hearing Kendall testified at, lawmakers said the spread of misinformation on Facebook could be cause for future government regulation of social media platforms.
