▁a ▁British ▁and ▁American ▁psych ologist , ▁known ▁for ▁his ▁psych ometric ▁research ▁into ▁int rap erson al ▁psych ological ▁structure . ▁His ▁work ▁also ▁expl ored ▁the ▁basic ▁dimensions ▁of ▁person ality ▁and ▁temper ament , ▁the ▁range ▁of ▁cogn itive ▁ab ilities , ▁the ▁dynamic ▁dimensions ▁of ▁motiv ation ▁and ▁em otion , ▁the ▁clin ical ▁dimensions ▁of ▁ab normal ▁person ality , ▁patterns ▁of ▁group ▁s ynt ality ▁and ▁social ▁behavior , ▁applications ▁of ▁person ality ▁research ▁to ▁psych other apy ▁and ▁learning ▁theory , ▁predict ors ▁of ▁cre ativity ▁and ▁achiev ement , ▁and ▁many ▁mult ivari ate ▁research ▁methods ▁including ▁the ▁ref in ement ▁of ▁factor ▁analyt ic ▁methods ▁for ▁expl oring ▁and ▁meas uring ▁these ▁domains . ▁C att ell ▁author ed , ▁co - author ed , ▁or ▁edited ▁almost ▁ 6 0 ▁scholar ly ▁books , ▁more ▁than ▁ 5 0 0 ▁research ▁articles , ▁and ▁over ▁ 3 0 ▁standard ized ▁psych ometric ▁tests , ▁question na ires , ▁and ▁rating ▁scales . ▁ ▁According ▁to ▁a ▁widely ▁c ited ▁ranking , ▁C att ell ▁was ▁the ▁ 1 6 th ▁most ▁em inent , ▁ 7 th ▁most ▁c ited ▁in ▁the ▁scientific ▁journal ▁literature , ▁and ▁among ▁the ▁most ▁product ive , ▁but ▁controvers ial ▁psych olog ists ▁of ▁the ▁ 2 0 th ▁century . ▁ ▁C att ell ▁was ▁an ▁early ▁pro ponent ▁of ▁using ▁factor ▁analyt ic ▁methods ▁instead ▁of ▁what ▁he ▁called ▁" subject ive ▁ver bal ▁the