Philadelphia litigator Aliza Karetnick is taking her practice from one locally headquartered Am Law 100 firm to another.

Karetnick, a commercial litigation and intellectual property lawyer, joined Ballard Spahr Tuesday as a partner in Philadelphia. She comes from Duane Morris, where she has practiced since 2009, when she joined with a group of lawyers from now-defunct firm Wolf Block.

Aliza Karetnick.