▁rational . ▁ ▁At ▁Harvard , ▁Tw ers ky ▁taught ▁both ▁under grad uate ▁and ▁gradu ate ▁students . ▁His ▁popular ▁course , ▁Mod er ation ▁and ▁Ext rem ism , ▁which ▁compared ▁and ▁contrast ed ▁the ▁paths ▁to ▁virtue ▁in ▁the ▁works ▁of ▁Arist ot le , ▁Ma imon ides , ▁and ▁Thomas ▁Aqu inas , ▁drew ▁over ▁ 2 0 0 ▁students ▁in ▁ 1 9 9 5 , ▁the ▁final ▁year ▁it ▁was ▁taught . ▁Over ▁the ▁course ▁of ▁his ▁thirty ▁years ▁at ▁Harvard , ▁he ▁taught ▁a ▁large ▁number ▁of ▁gradu ate ▁students . ▁His ▁exact ing ▁standards ▁and ▁expect ations ▁were ▁legend ary . ▁Nevertheless , ▁over ▁thirty ▁individuals ▁completed ▁their ▁doctor ates ▁under ▁his ▁guidance . ▁Many ▁of ▁these ▁play ▁leading ▁roles ▁in ▁Jewish ▁studies , ▁both ▁in ▁North ▁America ▁and ▁in ▁Israel . ▁Among ▁these ▁are ▁Morris ▁( M os he ▁B .) ▁Ber ger ▁( C leveland ▁College ▁of ▁Jewish ▁Studies , ▁Edward ▁Bre uer ▁( H eb rew ▁University ), ▁Bernard ▁D ov ▁Co op erman ▁( Univers ity ▁of ▁Maryland ), ▁Joseph ▁M . ▁Davis ▁( Gr atz ▁College ), ▁Lo is ▁Dub in ▁( Smith ▁College ), ▁David ▁Fish man ▁Jewish ▁The ological ▁Sem inary , ▁Tal ya ▁Fish man ▁( Univers ity ▁of ▁Pennsylvania ), ▁Roman ▁A . ▁Fox br un ner , ▁Daniel ▁Frank ▁( Oh io ▁State ▁University ), ▁Steven ▁Har vey ▁( Bar ▁Il an ▁University ), ▁Car mi ▁Hor ow itz ▁( Mich le let ▁Y er