bled ▁in ▁scen ic ▁design . ▁ ▁He ▁is ▁also ▁published ▁many ▁articles ▁in ▁different ▁mag az ines ▁and ▁newsp apers ▁such ▁as ▁American ▁Theater , ▁The ▁New ▁York ▁Times , ▁Theater Week , ▁The ▁D rama ▁Review , ▁The ▁Chron icle ▁of ▁High er ▁Education , ▁Contempor ary ▁Design ers , ▁and ▁Theater ▁C raft s . ▁ ▁Te aching ▁ ▁R idd ell ▁taught ▁in ▁the ▁the ater ▁department ▁at ▁the ▁University ▁of ▁California , ▁San ▁Diego ▁from ▁ 1 9 7 8 ▁to ▁ 1 9 8 7 . ▁He ▁then ▁became ▁the ▁director ▁of ▁the ▁Institute ▁for ▁Advanced ▁Theatre ▁Training ▁at ▁Harvard ▁University ▁until ▁ 1 9 9 1 . ▁He ▁moved ▁to ▁work ▁at ▁Duke ▁in ▁ 1 9 9 2 ▁as ▁the ▁Mary ▁D . B . T . ▁and ▁James ▁H . ▁Sem ans ▁Professor ▁of ▁the ▁Pract ice ▁of ▁Theater ▁Studies , ▁teaching ▁classes ▁such ▁as ▁" Ar ts ▁and ▁Contempor ary ▁Society ", ▁" Light ing ▁Design ▁for ▁the ▁Theater ", ▁and ▁" Ar ts ▁and ▁Stage ▁in ▁the ▁ 2 0 th ▁Century ". ▁He ▁also ▁became ▁the ▁chairman ▁of ▁Duke ' s ▁Department ▁of ▁Theater ▁Studies . ▁In ▁ 2 0 0 7 , ▁it ▁was ▁announced ▁that ▁he ▁would ▁succeed ▁All ison ▁H alt om ▁as ▁Duke ' s ▁vice ▁president ▁and ▁secretary , ▁as ▁well ▁as ▁retain ▁his ▁position ▁as ▁assistant ▁to ▁the ▁president . ▁ ▁Design s ▁ ▁He ▁designed ▁lights ▁for ▁such ▁shows ▁as ▁The ▁Philadelphia ▁Story ▁for