John Tierney

Sam (Chris Carmack) goes into the past to find the Pontiac Killer, but ends up only finding himself.

Sam (Chris Carmack) wakes up to a slightly different reality and drops in at the police station to view the case file on his dead girlfriend's murder. Detective Jack Nicholas (Hugh Maguire) suggests that Sam might be the killer.

Sam's (Chris Carmack) mentor Harry Goldburg (Kevin Yon) helps him formulate a plan to stop the serial killer that he has inadvertently created.

Sam (Chris Carmack) uses his 'get out of jail card' when he tells Detective Dan Glenn (Lynch R. Travis) what his wife first said to him.

Sam Reide (Chris Carmack) visits Lonnie Flennons (Richard Wilkinson) in prison to show him dead girl's diary. It supposedly proves Lonnie didn't kill her, but Lonnie doesn't care, he thinks Sam did.

John Tierney, columnist for the New York Times, weighs in on what makes a memorable holiday gift.

John Krasinski talks about working with James Spader and Maura Tierney on the episode "Mrs. California."

John Krasinski talks about working with James Spader and Maura Tierney on the episode "Mrs. California."

Actors John Stamos (Dr. Tony Gates), Maura Tierney (Nurse Abby Lockhart), Scott Grimes (Dr. Archie Morris), and Mekhi Phifer (Dr. Gregory Pratt) talk about the logistics of acting long scenes shot with one camera and dealing with medical terminology.

ER has reached the end of its era and is celebrating with a red carpet. Noah Wyle, John Stamos, Alex Kingston, Maura Tierney, Sharif Atkins, Angela Bassett, James Cromwell, Donal Logue, Sam Jones III & Michael Michele were all there!

Actress Maura Tierney (Nurse Abby Lockhart) and executive producer/writer/director John Wells reminisce about a messy scene in the rain. Executive producer/show runner David Zabel talks about logistics and the writing pace of the show.

The thing that may be holding you back from reaching your potential my be a lack of willpower. Russ Mitchell speaks with the co-author of "Willpower," John Tierney, and Early Show contributor Dr. Jennifer Hartstein about what willpower is and how it affects you life.