Gideon

Jason Gideon is a criminal profiler who is formerly the Senior Supervisory Special Agent of the FBI's Behavioral Analysis Unit. (bot)

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The last straw was Hotchner's two-week suspension, for which Gideon felt responsible.

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and another which ended with the deaths of two UnSubs, Gideon began feeling very burned out.

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one of which resulted in the death of his girlfriend

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After a series of emotional cases,

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He had a son named Steven.

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who would later become a victim of psychopathic serial killing machine, Frank Breitkopf.

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He had a relationship with a woman named Sarah Jacobs,

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He is also an avid chess player, shown playing with--and beating--Dr. Reid on several occasions.

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Gideon has a knack for counseling his colleagues and has been a great help to both Derek Morgan and Spencer Reid.

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He would then become Senior Supervisory Special Agent up until his departure in Season Three.

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Upon his return, he was reinstated as Unit Chief but later stepped down and allowed Hotch to take his place.

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He was called back from medical leave in the pilot episode, "Extreme Aggressor".

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in a warehouse bombing before the beginning of the series.

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Gideon had reportedly suffered a nervous breakdown due to the death of six of his colleagues

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The position is now held by David Rossi (Joe Mantegna) who replaced Gideon in Season 3's About Face and has held it to this day.

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He was sort of a mentor for Spencer Reid, who looked up to him.

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the actor who plays Gideon wishing to leave the show as he loathed the violent nature of it.

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This is due to Mandy Patinkin,

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Sarah Jacobs at the hands of a serial killer.

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At the beginning of Season 3, Gideon abruptly quits from the BAU for good due to emotional issues in regards to the death of his girlfriend,