ell ▁had ▁accepted ▁a ▁position ▁teaching ▁and ▁coun sel ing ▁in ▁the ▁Department ▁of ▁Education ▁at ▁Ex eter ▁University . ▁He ▁ultimately ▁found ▁this ▁disappoint ing ▁because ▁there ▁was ▁limited ▁opportunity ▁to ▁conduct ▁research . ▁C att ell ▁did ▁his ▁gradu ate ▁work ▁with ▁Charles ▁Spe ar man , ▁the ▁English ▁psych ologist ▁and ▁stat istic ian ▁who ▁is ▁famous ▁for ▁his ▁pione ering ▁work ▁on ▁assess ing ▁intelligence , ▁including ▁the ▁development ▁of ▁the ▁idea ▁of ▁a ▁general ▁factor ▁of ▁intelligence ▁term ed ▁g . ▁During ▁his ▁three ▁years ▁at ▁Ex eter , ▁C att ell ▁court ed ▁and ▁married ▁Mon ica ▁Rog ers , ▁whom ▁he ▁had ▁known ▁since ▁his ▁boy hood ▁in ▁Dev on ▁and ▁they ▁had ▁a ▁son ▁together . ▁She ▁left ▁him ▁about ▁four ▁years ▁later . ▁So on ▁after ward ▁he ▁moved ▁to ▁Le ic ester ▁where ▁he ▁organized ▁one ▁of ▁England ' s ▁first ▁child ▁guidance ▁clin ics . ▁It ▁was ▁also ▁in ▁this ▁time ▁period ▁that ▁he ▁finished ▁his ▁first ▁book ▁" Under ▁S ail ▁Through ▁Red ▁Dev on ," ▁which ▁described ▁his ▁many ▁advent ures ▁sail ing ▁around ▁the ▁coast line ▁and ▁est u aries ▁of ▁South ▁Dev on ▁and ▁D art mo or . ▁ ▁United ▁States ▁In ▁ 1 9 3 7 , ▁C att ell ▁left ▁England ▁and ▁moved ▁to ▁the ▁United ▁States ▁when ▁he ▁was ▁invited ▁by ▁Edward ▁Thor nd ike ▁to ▁come ▁to ▁Columbia ▁University . ▁When ▁the ▁G . ▁Stanley ▁Hall ▁professor ship ▁in ▁psych ology ▁became ▁available