Making good on plans to expand its practice statewide, Archer & Greiner on Thursday announced a merger that crests its ranks over 200 lawyers and gives it a strong foothold in northern New Jersey.

Effective May 2, the 170-lawyer Haddonfield firm will absorb 31-lawyer Herten, Burstein, Sheridan, Cevasco, Bottinelli, Litt & Harz of Hackensack.