Previously, Oppenheim was the executive in charge and senior producer of NBC's Today Show, where he supervised the 7–8am hour of the broadcast, and head of development at the production company Reveille.
[8] The series’ volume "The Intellectual Devotional, American History" made The New York Times Best Seller list for political books in 2007.
[12][13] In November 2022, Variety reported that Oppenheim and Eric Newman co-wrote a political thriller series in production for Netflix called Zero Day, starring Robert De Niro as a former US president.
[21] He left MSNBC in 2004, returning NBC News in 2005, where he helped create CNBC's Mad Money with Jim Cramer, and worked as the senior producer of The Today Show until 2008.
[29][30] In June 2019, Oppenheim was one of three heads of U.S. broadcast news outlets to promise that coverage of the 2020 presidential election cycle to be more in-depth and "nuanced."
[36] In 2021, Oppenheim served as executive producer on the NBC News Studios projects The Thing About Pam[37][38][39] and Memory Box: Echoes of 9/11.
[5] According to Variety, Oppenheim expanded NBC News during his tenure, including by introducing streaming services, podcasts and digital products based on the morning show Today.
Oppenheim denied Farrow's claim and said that the reason NBC News chose not to report on the story was that the available evidence did not meet their journalistic standards.
[44] Oppenheim denied that NBC hid the Matt Lauer accusations over the years and calls Farrow's book a "smear" though many on his staff remain skeptical.