▁into ▁SD - 6 ▁by ▁Slo ane ▁when ▁the ▁Alliance ▁of ▁Tw elve ▁was ▁founded , ▁and ▁was ▁one ▁of ▁the ▁few ▁agents ▁who ▁knew ▁the ▁truth ▁behind ▁the ▁cell . ▁He ▁was ▁also ▁Director ▁of ▁Oper ations ▁at ▁SD - 6 , ▁and ▁many ▁in ▁the ▁Alliance ▁believed ▁he ▁was ▁a ▁logical ▁choice ▁to ▁take ▁Slo ane ' s ▁place . ▁ ▁When ▁Sydney ▁was ▁in ▁college , ▁Ar vin ▁Slo ane ▁had ▁her ▁rec ru ited ▁into ▁SD - 6 ▁without ▁Jack ' s ▁knowledge . ▁Jack ▁react ed ▁neg atively ▁to ▁Sydney ' s ▁telling ▁him ▁that ▁she ▁had ▁got ten ▁a ▁job ▁at ▁Cred it ▁D au ph ine , ▁the ▁front ▁company ▁for ▁SD - 6 . ▁However , ▁Jack ' s ▁reaction ▁made ▁Sydney ▁more ▁determined ▁to ▁be ▁a ▁part ▁of ▁the ▁" CI A ". ▁Jack ▁later ▁revealed ▁to ▁Sydney ▁that ▁he ▁had ▁recognized ▁her ▁potential , ▁but ▁wanted ▁to ▁keep ▁her ▁away ▁from ▁this ▁life , ▁away ▁from ▁making ▁the ▁choices ▁that ▁he ▁had ▁to ▁and ▁eventually ▁she ▁had ▁to ▁as ▁an ▁agent . ▁Sydney ' s ▁rec ruit ment ▁into ▁SD - 6 ▁also ▁ended ▁Jack ' s ▁friendship ▁with ▁Slo ane , ▁although , ▁because ▁of ▁the ▁c land est ine ▁nature ▁of ▁Jack ' s ▁work ▁as ▁a ▁double - agent ▁at ▁SD - 6 , ▁he ▁couldn ' t ▁reve al ▁that ▁to ▁Slo ane ▁until ▁years ▁after . ▁ ▁Several ▁years ▁later ▁when ▁Sydney ▁herself ▁becomes ▁a ▁double ▁agent ▁for