Veteran Manhattan prosecutors Leroy Frazer Jr. and Coleen Balbert are joining the newly-minted administration of Brooklyn District Attorney Kenneth Thompson as chief of staff and chief of sex crimes, respectively.

Frazer, executive assistant district attorney for external affairs in the New York County District Attorney’s Office, has worked for the Manhattan prosecutor since 1980. He began as an assistant district attorney in the trial division, handling street crime cases ranging from larcenies to homicides.

Balbert was deputy chief of the sex crimes unit in Manhattan, supervising more than 50 prosecutors, investigators and support staff. She joined the Manhattan District Attorney’s office in 1998 and worked in the trial division until 2006.

“With the appointments of Leroy Frazer and Coleen Balbert, my administration continues to fulfill its commitment to legal excellence and high standards in prosecution and law enforcement,” Thompson said in a statement last week announcing the appointments. “Leroy Frazer is an outstanding prosecutor, with vast experience in law enforcement and management. Coleen Balbert is one of the finest sex crimes and human trafficking prosecutors in the country.”

Frazer will be paid $189,000 annually. Balbert’s salary was not immediately available.