NEW YORK (WABC) -- NYPD Chief of Detectives Dermot Shea will be promoted to the position of New York City Police Commissioner after current top cop James O'Neill announced his resignation Monday, and on Tuesday, he talked with Eyewitness News about his goals and the challenges he faces.
And he says his work has already begun.
"I haven't slept too well the last couple of nights," he said.
And those sleepless nights might just be beginning. There are new criminal justice reforms set to begin in January, just one month after Shea takes on his new role as commissioner starting December 1.
The changes including the "Raise the Age Initiative," which will mean not charging 16 and 17 year olds as adults; and bail reforms, which eliminate bail for a slew of misdemeanor and felony crimes.
Related: Who is Dermot Shea, New York City's next police commissioner
The reforms are reportedly a major concern for O'Neill.
"We've been looking at this for a while," Shea said. "We've been putting some plans in place to deal with it, and we will adjust accordingly."
The department is also preparing for new laws that will require prosecutors to turn over evidence quicker.
"There's a lot of work that has to be done in terms of the discovery piece initially, how we set up, how we turn over information, how it's turned over more quickly," Shea said. "So there's a huge component to this that is causing some headaches for our IT people."
Despite the concerns of some, the incoming commissioner is preparing his department and trying to assure New Yorkers that the NYPD is ready for the changes.
"I have faith in the NYPD," he said. "We will do everything we can to keep people safe."
Shea said he will target gang-related violence, work to take guns off the streets, and hopefully continue the city's reduction in crime.
"This is a tremendous honor and a tremendous responsibility and I'm grateful to the mayor for this privilege to serve," Shea said Monday. "Police Commissioner O'Neill has been a mentor and a friend to me, and I am committed to building on the incredible success of Neighborhood Policing and precision policing, while continuing my life's work to eradicate gangs and guns from our streets. Every New Yorker deserves to be safe and feel safe, and that has been my mission since I took the oath and became a police officer 28 years ago. As police commissioner, this will be what drives me."
PBA President Patrick Lynch released the following statement about Shea's promotion:
"The challenges facing the NYPD are enormous, but so are the opportunities. We look forward to working with Commissioner Shea to combat the current anti-police atmosphere and make positive changes that will improve the lives of our police officers and every New Yorker we protect."
Shea succeeded Robert Boyce as Chief of Detectives in 2018. Before taking that job, he served as the department's senior crime control strategist, becoming publicly known as the department's "numbers guy" who breaks down crime statistics at news conferences.
Shea joined the NYPD in 1991 and rose through the ranks working in narcotics, investigations and plainclothes units in Manhattan, Queens and the Bronx. He commanded the 44th and 50th Precincts in the Bronx
He grew up in Sunnyside, Queens, and was one of five kids in an Irish-American family.
His brother, James Shea, retired from the NYPD as a deputy chief. But he didn't go very far -- just across the Hudson River where he serves as Jersey City Public Safety Director. His other brother Paul is deployed with the U.S. Army.
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Dermot Shea, NYPD's next commissioner, talks goals, challenges