The Boston NAACP selected an outspoken lawyer on Monday to replace Michael Curry, who is stepping down after six years as the branch’s president.

Tanisha Sullivan, a lawyer who was the initial investigator into allegations of racial discrimination at Boston Latin School, was the only candidate seeking the post.

At a meeting in Roxbury, members also voted to select Lori D. Nelson, a longtime NAACP stalwart, as first vice president over former state senator Dianne Wilkerson, who was seeking to make a comeback after her release from federal prison.

Curry, a lawyer and health care lobbyist, brought stability, relevancy, and power to the branch during his leadership at the all-volunteer organization. He played a key role in state and city redistricting, pushed for police body cameras, and helped to press a federal inquiry into racial tensions at Boston Latin. He said he plans to take a more active role in the national NAACP.

“Now, with attorney Sullivan’s leadership, we have an opportunity to expand our influence in addressing the critical issues impacting people of color in Boston,’’ Curry said. “She is the right person for a time such as this.’’

Sullivan, a self-described business and legal affairs specialist, is a regional leader for the Delta Sigma Theta Sorority, a private organization committed to community development, according to Curry.

She was the chief office of equity officer in the school department under former superintendent Carol R. Johnson and former interim superintendent John McDonough. Sullivan was out of the country Monday, Curry said, and could not be reached for comment.

In 2014, Curry said, Sullivan took the lead after turmoil engulfed Boston Latin Academy when dozens of teachers accused the headmaster and other administrators of lowering academic standards, penalizing those who refused to comply, and otherwise “creating fear and insecurity amongst faculty.’’

The case, Curry said, resulted in significant changes at the school.

Sullivan was also at the school department when McDonough received the official complaint of race allegations at Boston Latin, Curry added.

Meghan E. Irons can be reached at meghan.irons@globe.com. Follow her on Twitter @meghanirons.