Guest Star: Brian Posehn

Brian Posehn is an American actor, comedian and voice actor, perhaps best known for his recurring roles on Just Shoot Me! and The Sarah Silverman Program. He has also provided voices for series including Mission Hill, Out of Jimmy's Head and Symb-Bionic Titan.

Alongside his appearances as Bert the geologist on The Big Bang Theory, Brian Posehn has also recently had a recurring role on FOX's New Girl.

On the big screen, Posehn has appeared in films including Dumb and Dumberer: When Harry Met Lloyd, Grind, Fantastic 4: Rise of the Silver Surfer, and has also provided voices in Surf's Up and Captain Underpants: The First Epic Movie.

You are viewing a list of Brian Posehn's 15 appearances on The Big Bang Theory.

  • The Contractual Obligation Implementation

    The Contractual Obligation Implementation
    Season 6, Episode 18 - Aired March 7, 2013

    When Raj decides to have a silent 'text date' with Lucy at the library, Bert tries to join them at the table.

    Appeared as Bert

  • The Occupation Recalibration

    The Occupation Recalibration
    Season 7, Episode 13 - Aired January 9, 2014

    When Bert brings Amy pretty rocks he's found as a gift, Amy is oblivious to the fact he has a crush on her. Howard and Raj try to let Bert down gently.

    Appeared as Bert

  • The Dependence Transcendence

    The Dependence Transcendence
    Season 10, Episode 3 - Aired October 3, 2016

    Amy and Penny attend a party at geologist Bert's house.

    Appeared as Bert

  • The Fetal Kick Catalyst

    The Fetal Kick Catalyst
    Season 10, Episode 6 - Aired October 27, 2016

    Bert, Amy's geologist friend, is invited to Sheldon And Amy's dinner party.

    Appeared as Bert

  • The Geology Elevation

    The Geology Elevation
    Season 10, Episode 9 - Aired November 17, 2016

    Sheldon is jealous when Amy's geologist friend, Bert, wins the MacArthur Fellowship.

    Appeared as Bert

  • The Allowance Evaporation

    The Allowance Evaporation
    Season 10, Episode 16 - Aired February 16, 2017

    Sheldon and Amy spot a dejected Bert in a restaurant as they enjoy date night together. When they invite Bert over, Amy learns that Sheldon has been sharing inappropriate information about their relationship with other people.

    Appeared as Bert

  • The Separation Agitation

    The Separation Agitation
    Season 10, Episode 21 - Aired April 13, 2017

    When Bert introduces the gang to his new girlfriend, Rebecca, they get the feeling she's with him for his money.

    Appeared as Bert

  • The Geology Methodology

    The Geology Methodology
    Season 11, Episode 7 - Aired November 9, 2017

    Bert offers Sheldon the chance to work with him on dark matter research, but Sheldon's sense of superiority soon offends Bert.

    Appeared as Bert

  • The Solo Oscillation

    The Solo Oscillation
    Season 11, Episode 13 - Aired January 11, 2018

    When Raj hears Bert's original song about boulders (specifically the one which chases Indian Jones), he invites Bert to join Footprints on the Moon.

    Appeared as Bert

  • The Bow Tie Asymmetry

    The Bow Tie Asymmetry
    Season 11, Episode 24 - Aired May 10, 2018

    Bert attends Sheldon and Amy's wedding.

    Appeared as Bert

  • The Wedding Gift Wormhole

    The Wedding Gift Wormhole
    Season 12, Episode 2 - Aired September 27, 2018

    When Sheldon and Amy can't figure out what their wedding gift from Leonard and Penny is, they take it to geologist Bert.

    Appeared as Bert

  • The Imitation Perturbation

    The Imitation Perturbation
    Season 12, Episode 6 - Aired October 25, 2018

    Bert attends Leonard and Penny's Halloween party.

    Appeared as Bert

  • The Meteorite Manifestation

    The Meteorite Manifestation
    Season 12, Episode 14 - Aired January 31, 2019

    Bert asks for Raj's help with a meteorite that may contain organic matter.

    Appeared as Bert

  • The Inspiration Deprivation

    The Inspiration Deprivation
    Season 12, Episode 19 - Aired April 18, 2019

    After Bernadette forces him to get rid of his scooter, Howard sells it to Bert.

    Appeared as Bert

  • The Stockholm Syndrome

    The Stockholm Syndrome
    Season 12, Episode 24 - Aired May 16, 2019

    When Raj goes to Sweden for the Nobel prize ceremony, Bert doggy sits Cinnamon.

    Appeared as Bert

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