08:13 AM EDT, 07/22/2025 (MT Newswires) -- Seres Therapeutics ( MCRB ) said Tuesday it has appointed Thomas DesRosier and Marella Thorell as co-Chief Executive Officers.

This appointment will follow the departure of Chief Executive Officer Eric Shaff on July 31 to pursue a new professional opportunity.

Mr. Shaff will continue to serve as a Director on the Seres Board, the company said, adding that Mr. DesRosier and Ms. Thorell will retain responsibilities related to their roles as Chief Legal Officer and Chief Financial Officer, respectively.

The company further added that it is engaging with multiple parties regarding various deal structures, including potential business development and partnerships, intended to secure additional capital and other resources to enable the clinical advancement of its biotherapeutics targeting serious bloodstream infections, as well as additional pipeline assets for inflammatory and immune diseases.