Michael O'Keefe
(© Joseph Marzullo/Retna)
Michael O'Keefe
(© Joseph Marzullo/Retna)
Stage and television veterans Jon Tenney and Michael O'Keefe will guest star on ABC's hit series Brothers & Sisters.

Tenney will play Dr. Simon Craig, who gets involved with family matriarch Nora (played by Sally Field); O'Keefe will play Wally Wandell, the father of Scotty (played by Luke Macfarlane). Tenney also stars on TNT's The Closer; O'Keefe is best known for his work on Roseanne.

The series also stars Dave Annable as Justin Walker, Maxwell Perry Cotton as Cooper Whedon, Kerris Lilla Dorsey as Paige, Calista Flockhart as Kitty Walker, Balthazar Getty as Thomas Walker, Rachel Griffiths as Sarah Walker, Luke Grimes as Ryan Lafferty, Rob Lowe as Senator Robert McCallister, Matthew Rhys as Kevin Walker, Ron Rifkin as Saul Holden, Emily VanCamp as Rebecca Harper, Patricia Wettig as Holly Harper, and Gilles Marini as Luc Laurent.