Warren Lieberstein  Warren Keith Lieberstein (born September 20, 1968) is an American writer and producer. He has worked on shows such as "Carpoolers" and "The Office", to which he has extensive ties. He is the younger brother of the show's former showrunner/actor Paul Lieberstein and brother-in-law of its developer and original producer Greg Daniels. He and Angela Kinsey (who plays Angela) were married for ten years and have a daughter who was born in 2008. The pair have remained on good terms since their divorce. Lieberstein married fellow television writer Audrey Wauchope in 2016 and they have two daughters together, born in 2014 and 2017 His family is Jewish. He often works with his writing partner Halsted Sullivan. Lieberstein worked on the short-lived sketch comedy series "Hype" in 2000 and on ABC's 2003 series "All of Us". He has also written for "Second Time Around", "Modern Men" and "Carpoolers". He joined his brother on the writing staff of "The Office" at the end of its fifth season and became a producer at the beginning of the sixth season. He was nominated for a Writers Guild of America award for writing on "The Office". Episodes are all co-written with Halsted Sullivan.