During his time there, Kirsch focused on prosecuting white collar crime.

[4] From 2010 to 2023, he has served as a judge of the New Jersey Superior Court for Union County.

[2] Kirsch was recommended for the court seat by Senator Robert Menendez.

President Biden nominated Kirsch to the seat vacated by Judge Freda L. Wolfson, who retired on February 1, 2023.

[11] Kirsch was a Republican[5] until 2021, when he changed his registration to unaffiliated after the January 6 United States Capitol attack.