Movies:
* The Happening (2008) - As "Student 1"
* The Fourth Kind (2009) - As "Jim"
* The Invention of Lying (2009) - As "Josh"
* The Romantics (2010) - As "Peter"
* Going the Distance (2010) - As "Daniel"
* The Guilt Trip (2012) - As "Doug"
* Life of Crime (2013) - As "Jimmy"
* The Rewrite (2014) - As "Adam"
* The Stanford Prison Experiment (2015) - As "Dr. Philip Zimbardo" (narrator)
* Don't Think Twice (2016) - As "Miles"
Television:
* Law & Order: Special Victims Unit (2008) - As "Peter" in the episode "Hammered"
* Rescue Me (2009) - As "Danny" in the episode "Danny, You're a Star"
* Ugly Betty (2009) - As "Luke" in the episode "The Woman Who Knew Too Much"
* The Good Wife (2010) - As "Matt" in the episode "The Deep Web"
* The Office (2011) - As "Mike" in the episode "The Incentive"
* The Newsroom (2012-2014) - As "Garrett" in 20 episodes
* Younger (2015-2021) - As "Josh" in 76 episodes
* The Sinner (2017) - As "Mike" in the episode "Part V"
* The Marvelous Mrs. Maisel (2017) - As "David" in the episode "Marvelous Radio"
* Grace and Frankie (2017-2022) - As "Cody" in 10 episodes
* The Other Two (2019-present) - As "Cary" (recurring role)
This is not an exhaustive list, but it covers some of his most prominent roles. Adam Jonas Segaller is a versatile actor with a diverse range, working across different genres and platforms.