Two senior staffers at BioShock developer Irrational Games have left the company: art director Nate Wells, a 13-year veteran of the Boston area studio, and director of product development Tim Gerritsen. The two were part of the team developing next year's BioShock Infinite.

Wells' credits include the original BioShock, Freedom Force, and System Shock 2. Gamasutra's report on the departures indicates that Wells may have found a new home at Uncharted series developer Naughty Dog.

Gerritsen, previously at Rune and Prey developer Human Head Studios, joined Irrational in 2010, the year BioShock Infinite was announced. In his LinkedIn profile, Gerritsen writes he "oversaw the product development division of the company, and directly managed the content creators for BioShock Infinite" during his tenure at Irrational.

Last year, noteworthy Irrational Games staffers Steve Gaynor and Chris Remo left the studio. Gaynor, who worked at BioShock 2 developer 2K Marin, wrote and designed the game's "Minerva's Den" expansion before joining Irrational. Gaynor has since co-founded The Fullbright Company. Remo served as community manager and producer at Irrational before leaving for Double Fine Productions and Idle Thumbs. Both were with the studio for about a year.

In May, Irrational creative director Ken Levine announced BioShock Infinite had been pushed to February 2013, also revealing that the game would not make appearances at E3 or Gamescom.

On Twitter today, Levine said that Scott Sinclair, art director of the original BioShock, was "back in the art director's chair for Infinite to bring it home." Added Levine, "Can't wait to show you what's cooking."

Publisher Take-Two Interactive said in its most recent quarterly statement that BioShock Infinite was still scheduled for a February 26th, 2013 release on PC, Xbox 360, and PlayStation 3.