▁he ▁lear ns ▁his ▁girl friend ▁Sav ann ah ▁is ▁pre gn ant , ▁he ▁real izes ▁that ▁he ▁doesn ' t ▁want ▁to ▁put ▁his ▁family ▁through ▁something ▁like ▁this ▁again . ▁D erek ▁leaves ▁the ▁B AU ▁in ▁the ▁episode ▁" A ▁Beautiful ▁Dis aster " ▁to ▁care ▁for ▁his ▁now - w ife ▁and ▁new born ▁son . ▁ ▁Sp encer ▁Re id ▁( M att hew ▁Gray ▁G ub ler ), ▁super vis ory ▁special ▁agent ▁( all ▁seasons ) ▁ ▁Re id ▁is ▁a ▁genius ▁who ▁graduated ▁from ▁Las ▁Veg as ▁High ▁School ▁at ▁age ▁ 1 2 ▁and ▁holds ▁Ph . D . s ▁in ▁mathematics , ▁chem istry , ▁and ▁engineering ▁as ▁well ▁as ▁b ach elor ▁of ▁arts ▁degrees ▁in ▁psych ology ▁and ▁soci ology ▁and , ▁as ▁of ▁season ▁ 4 , ▁is ▁working ▁on ▁a ▁B . A . ▁in ▁philosophy . ▁It ▁has ▁been ▁revealed ▁that ▁he ▁has ▁an ▁I Q ▁of ▁ 1 8 7 , ▁can ▁read ▁a ▁d iz zy ing ▁ 2 0 , 0 0 0 ▁words ▁per ▁minute , ▁and ▁has ▁an ▁e id etic ▁memory . ▁Most ▁of ▁the ▁members ▁on ▁the ▁team ▁are ▁int im id ated ▁by ▁his ▁prof ound ▁knowledge . ▁He ▁is ▁habit ually ▁introduced ▁as ▁" Dr . ▁Sp encer ▁Re id " ▁in ▁contrast ▁to ▁the ▁other ▁agents , ▁who ▁are ▁introduced ▁as ▁" super vis ory ▁special ▁agent ". ▁The ▁purpose ▁of ▁this , ▁as ▁explained ▁by ▁Unit