The new Delco DA talks victories, ambitions, and the importance of mentorship
Newly appointed Delaware County District Attorney Tanner Rouse said he hopes to continue to improve the way crime is prosecuted in the suburb.
Tanner Rouse will be Delaware County’s new top law enforcement officer, but he’s not new to the work.
Rouse will be sworn in on Jan. 5 as district attorney after his predecessor, Jack Stollsteimer, steps down to assume the county judgeship he won in November. Rouse, 42, will finish out the final two years of Stollsteimer’s term after working as his first assistant since 2020.
In a recent interview, Rouse discussed the strides in reducing violent crime he and his colleagues have made under Stollsteimer — the first-ever Democrat to serve as district attorney in Delaware County — as well as how he plans to continue those advances.
The short answer: Keeping the same playbook, but “putting a personal stamp on it,” as an offensive coordinator does when he takes over as head coach, said Rouse, an avid Eagles fan and ambitious Little League coach.
A former Philadelphia prosecutor under Seth Williams, Rouse credited the lessons he learned from investigating gun violence in the city, along with the recruitment of several former colleagues he brought over the county line, with improving the way crime is prosecuted in Delaware County.
“We have demonstrated you can reform the criminal justice system and that it doesn’t have to come at the expense of stopping violent crime,” Rouse said. “They’re not mutually exclusive.”
Who is Tanner Rouse?
Rouse, a Phoenixville-area native, is the son of the late Willard Rouse III, the prominent Philadelphia developer behind One and Two Liberty Place. After graduating from the University of Wisconsin and Fordham Law School, Rouse spent seven years in the Philadelphia District Attorney’s Office, prosecuting crimes in Center City and North Philadelphia.
Rouse left the office in 2017, months before Larry Krasner took over. He practiced civil law for a time and ran an ultimately failed campaign to unseat then-State Sen. Tom McGarrigle before Stollsteimer called and offered him the first assistant job.
At the time, Rouse said, the offer was unexpected. But, looking back, he now considers it one of the greatest opportunities of his career.
What is Rouse most proud of from his tenure as first assistant?
The most notable achievement of his tenure to date in the district attorney’s office, Rouse said, is the steep reduction of gun violence in Chester. Shootings are down 75% since 2020. Rouse credits community outreach efforts for that, especially through the Chester Partnership for Safe Neighborhoods program, overseen by veteran homicide prosecutor Matt Krouse, whom Rouse worked with in Philadelphia and recruited to join him in Delaware County.
The partnership’s fundamental philosophy is a combination of focused deterrence programs Rouse helped oversee in Philadelphia that target repeat offenders, as well as community outreach efforts run by trusted neighborhood figures.
Rouse said he never wanted to be a faceless presence in the county and made it his priority to get out and form relationships in all of the municipalities he served, visiting community meetings, block parties, and even a few pickup basketball games.
“I don’t do this job from behind a desk,” he said, speaking in his county courthouse office. “And I think demonstrating that commitment and that care by being more present in those communities, and not just being kind of the big, scary law enforcement agency on a hill is incredibly important.”
Rouse said he is proud of other reforms including creating a diversionary unit in the office, revamping its drug court and instituting a special “child’s court,” created by Kristen Kemp — Rouse’s chosen first assistant and an expert in special-victims’ cases — that allows young victims to testify against adult offenders in a more comfortable environment.
The county’s jail population is down 50% as well, something Rouse says is a result of approaching prosecuting crimes in a humane, logical way.
What are his priorities as district attorney?
Rouse said he plans to create a similar community outreach program in Upper Darby, a community he said is “on the verge of some big things.”
“It’s not as if we’re saying, ‘We’re coming in here to take on Upper Darby and what goes on there,’ but more of, ‘Guys, look, we’re not just the people you pick up and call when there’s a crime.’”
He also expressed interest in creating reciprocity agreements with his counterparts in the other collar counties around Philadelphia, specifically when it comes to handling drug cases and providing treatment to the people caught up in them.
How has his time in Philadelphia influenced his work in Delco?
Rouse said he cut his teeth in the city working alongside veteran prosecutors, and he’s worked to bring that environment of mentorship to Delaware County.
He said he and his more senior deputies often sit in on trials, giving feedback to younger staff members just as his mentors did for him nearly two decades ago.
“That’s how I got better, and that’s one of the roles I most cherish here,” he said.