▁of ▁which ▁Car rer as ▁has ▁been ▁referred ▁as ▁one ▁of ▁its ▁" leading ▁ide olog ists ". ▁ ▁Ten ured ▁professor ▁in ▁possession ▁of ▁a ▁Chair ▁in ▁Constitution al ▁Law ▁at ▁the ▁Aut onom ous ▁University ▁of ▁Barcelona ▁( U AB ), ▁he ▁retired ▁in ▁September ▁ 2 0 1 3 . ▁Elect ed ▁as ▁numer ary ▁member ▁of ▁the ▁Royal ▁Academy ▁of ▁Mor al ▁and ▁Political ▁Sciences ▁in ▁January ▁ 2 0 1 5 , ▁he ▁took ▁possession ▁of ▁the ▁medal ▁number ▁ 2 7 ▁on ▁ 1 5 ▁November ▁ 2 0 1 6 , ▁covering ▁the ▁vac ant ▁left ▁by ▁Manuel ▁Jim é nez ▁de ▁P arga ▁( his ▁Ph D ▁th esis ▁super visor ), ▁reading ▁a ▁speech ▁titled ▁En say os ▁sobre ▁el ▁federal ismo ▁(" E ss ays ▁about ▁the ▁Federal ism "). ▁ ▁Car rer as ▁has ▁been ▁a ▁critic ▁of ▁the ▁right wing ▁dr ift ▁of ▁Cs ▁driven ▁by ▁party ▁leader ▁Albert ▁River a ▁( his ▁former ▁pup il ), ▁warning ▁in ▁ 2 0 1 9 ▁that ▁the ▁later ▁would ▁be ▁" put ting ▁alleg ed ▁party ▁interests ▁ahead ▁of ▁the ▁interests ▁of ▁Spain " ▁and ▁that ▁River a ▁had ▁turned ▁into ▁a ▁" cap r icious ▁te en ager ". ▁ ▁On ▁July ▁ 2 0 1 9 , ▁Car rer as , ▁one ▁of ▁the ▁party ' s ▁found ers , ▁announced ▁that ▁he ▁had ▁left ▁the ▁party ▁due ▁to ▁its ▁st ances ▁against ▁the ▁P SO E ▁and ▁in ▁favor