Aratana Therapeutics Inc. said Rip Gerber resigned from its board, and announced the appointment of Craig Barbarosh and Lowell Robinson as directors.

Engaged Capital LLC, which owns 5.2% of the Kansas-based pet therapeutics company, nominated the board members in April.

Barbarosh is a director and vice chairman at Quality Systems Inc. He is also a Sabra Health Care REIT Inc. board member.

Robinson is the former CFO, COO and chief administrative officer of MIVA Inc.