Evan H. Krinick, managing partner of Rivkin Radler, announced that Krystal Armstrong has joined the firm’s Uniondale office as an associate.

Armstrong, of Lake Grove, has joined the commercial litigation group.

Before joining Rivkin Radler, Armstrong was an associate at a private firm in New York City, where she practiced complex commercial litigation in federal and state courts. She earned her juris doctor from Maurice A. Deane School of Law at Hofstra University.