. ▁For ▁almost ▁forty ▁years ▁as ▁a ▁rest orer , ▁builder ▁or ▁expert , ▁he ▁fert il ized ▁organ ▁building ▁in ▁Paris , ▁ear ning ▁the ▁title ▁of ▁organ - builder ▁to ▁the ▁king . ▁He ▁launched ▁the ▁organ - building ▁care ers ▁of ▁his ▁sons ▁Charles , ▁Jean ▁( who ▁made ▁pip es ▁in ▁their ▁work shop ), ▁and ▁especially ▁Alexandre ▁Th ier ry , ▁the ▁most ▁gift ed ▁and ▁best ▁able ▁to ▁take ▁over ▁direction ▁of ▁the ▁family ▁firm ▁after ▁the ▁death ▁of ▁their ▁father . ▁The ▁dynast y ▁would ▁continue ▁into ▁a ▁third ▁generation ▁with ▁François ▁Th ier ry , ▁son ▁of ▁Jean . ▁ ▁Works ▁Works ▁that ▁have ▁been ▁identified ▁as ▁his ▁include ▁the ▁org ans ▁at : ▁Saint - Jac ques ▁de ▁la ▁B ouch erie , ▁Paris ▁Notre ▁D ame ▁de ▁Paris ▁in ▁ 1 6 3 6 ▁and ▁ 1 6 4 8 ▁Saint - G erm ain ▁l ' A ux er ro is ▁in ▁ 1 6 3 8 ▁St - Martin - des - Ch amps ▁Pri ory ▁in ▁ 1 6 4 2 ▁Par o isse ▁royale ▁Saint - Paul - des - Ch amps ▁( destroy ed ▁in ▁ 1 7 9 6 ) ▁between ▁ 1 6 4 4 ▁and ▁ 1 6 4 5 ▁Saint - Jac ques - de - l ’ H ô p ital - des - P é ler ins ▁Saint - S é ver in , ▁Paris ▁Saint - Jean - en - Gr