The president of the Southern Poverty Law Center, Richard Cohen, announced his resignation Friday, the latest in a series of high-profile departures at the anti-hate organization that have come amid allegations of misconduct and workplace discrimination.

The departure, just one week after he fired his longtime partner Morris Dees, will mark the end of an era at the Montgomery, Ala., nonprofit, whose staff had recently raised questions about whether the organization’s long-standing mission of justice and anti-discrimination — which had yielded hundreds of millions of dollars in donations from the public — had matched its internal treatment of some black and female employees.

“Whatever problems exist at the SPLC happened on my watch, so I take responsibility for them,” Cohen wrote in an email obtained by the Los Angeles Times, while asking the staff to avoid jumping to conclusions before the board completes an internal review of the organization’s work culture.

Cohen’s resignation comes the same day as a resignation by the organization’s legal director, Rhonda Brownstein, who did not give a reason for her departure in a brief email to her colleagues. Brownstein did not respond to requests for comment.

Cohen joined the Southern Poverty Law Center in 1986 and became one of its most prominent figures, helping wage legal and public campaigns against far-right groups, including neo-Nazis and the Ku Klux Klan.

Under Cohen’s watch, the center had also received frequent criticism for its aggressive fundraising tactics and for its depiction of some right-wing figures as extremists. And the organization had been unable to shake long-standing internal concerns over the diversity of its predominantly white staff and white leadership.

Cohen’s departure comes one week after he fired Dees — the center’s co-founder, chief trial counsel and its biggest public face for nearly half a century — for undisclosed misconduct, a move that stunned insiders and marked the most significant changing of the guard in the center’s history.

(Dees’ name will be familiar to longtime Oregonians for his role in a 1989 landmark case involving Ethiopian immigrant Mulugeta Seraw, who was beaten to death by skinheads. Dees teamed with Elden Rosenthal, a Portland personal-injury lawyer, to handle the local end of a lawsuit arguing neo-Nazi Tom Metzger and his group were civilly liable for inciting the violence. They won the wrongful death lawsuit on behalf of the Seraw family in Multnomah County Circuit Court.)

As for Cohen, he announced his departure in a message to staff, with the subject line “Stepping Down,” saying that he, too, would be leaving the organization that he and Dees had turned into a research and fundraising juggernaut.

Cohen told staff that he had asked the center’s board of directors in October to start searching for a new president, citing a need for a transition to a new generation of leadership. But “in light of recent events, I’ve asked the board to immediately launch a search for an interim president in order to give the organization the best chance to heal,” Cohen wrote.

Earlier this week, the board of directors announced that it had appointed Tina Tchen, the former chief of staff for former first lady Michelle Obama, to lead the inquiry into its workplace conditions.

“We’re going through a difficult period right now, and I know that we’ll emerge stronger at the end of the process that we’ve launched with Tina Tchen,” Cohen wrote. “Given my long tenure as the SPLC president, however, I do not think I should be involved in that process beyond cooperating with Tina, her team, and the board in any way that may be helpful.”

Cohen said it was an “incredible honor” to have served as the organization’s leader, adding: “Right now, we’re at a critical point in our country’s history. We owe it to those we serve to right the ship and do even greater things in the five decades to come.”

A spokesman for the Southern Poverty Law Center declined to comment.

The upheaval came amid staff concerns over the recent resignation of one of the organization’s top black attorneys, Meredith Horton, who wrote in a farewell email that “there is more work to do in the legal department and across the organization to ensure that SPLC is a place where everyone is heard and respected and where the values we are committed to pursuing externally are also being practiced internally.”

Following Horton’s announcement, a group of about two dozen employees signed a letter to management and to the board saying they were concerned that internal “allegations of mistreatment, sexual harassment, gender discrimination, and racism threaten the moral authority of this organization and our integrity along with it.”

In response, the organization’s leaders announced that corrective action would be taken.

As for Dees’ dismissal, the organization’s leadership did not disclose the reason. Staff were told in an internal email that “although he made unparalleled contributions to our work, no one’s contributions can excuse that person’s inappropriate conduct.”

The Los Angeles Times has also learned that the organization, whose leadership is predominantly white, has been wrestling with complaints that women and people of color employed there do not feel valued. It was not immediately clear whether those issues were connected to the firing of Dees.

Employees also sent two group letters to management demanding reforms, sparked at least in part by the resignation last week of Horton, who had been highly respected at the organization.

One letter — signed by about two dozen employees and sent to the board of directors before news broke of Dees’ firing — said that internal “allegations of mistreatment, sexual harassment, gender discrimination, and racism threaten the moral authority of this organization and our integrity along with it.”

Dees co-founded the Southern Poverty Law Center in 1971 and gained notoriety by suing members of the Ku Klux Klan, which resulted in the anti-hate organization’s offices being firebombed in 1983.

The son of a white tenant farmer in Alabama, he cut a swashbuckling figure as a Klan-busting attorney in the Deep South, drawing scorn in some mainstream corners for his showmanship and his prodigious fundraising abilities, which he had honed in his previous life as a millionaire direct-mail marketer.

His 1991 autobiography “reads like a treatment for a Hollywood epic,” The Times wrote in a review at the time.

In less mainstream corners, Dees’ name is loathed by white nationalists and other far-right groups targeted in lawsuits or published research by the center’s staff of lawyers, analysts and undercover operatives. In recent years, some conservatives have accused the center of casting too wide a net in defining what is a “hate” group.

Asked about the nature of Dees’ alleged misconduct, a spokesman for the organization said in an email: “We can’t comment on the details of individual personnel decisions.”

In an interview with The Montgomery Advertiser, Dees said: “It was not my decision, what they did. I wish the center the absolute best. Whatever reasons they had of theirs, I don’t know.”

In recent years, according to the center’s internal email to staff, Dees’ role has been focused on “donor relations” — expanding the Southern Poverty Law Center’s financial resources, which nearly totaled half a billion dollars in assets in 2017, according to the group’s most recently available public financial disclosures.

Over more than 40 years at the Southern Poverty Law Center, Dees formed coalitions with major civil rights groups, including the National Association for the Advancement of Colored People.