▁did ▁research ▁in ▁strongly ▁typed ▁languages , ▁and ▁to ▁make ▁sure ▁the ▁C ed ar ▁Program ming ▁Environment ▁benef ited ▁from ▁some ▁of ▁the ▁less ons ▁of ▁Inter l isp . ▁His ▁paper ▁“ A ▁Tour ▁Through ▁C ed ar ” ▁was ▁widely ▁published , ▁quoted , ▁and ▁even ▁translated ▁into ▁several ▁languages . ▁The ▁e pon ym ous ▁Te itel man ▁Princi ple ▁says ▁that ▁if ▁a ▁person ▁requests ▁a ▁feature ▁be ▁added ▁to ▁a ▁program , ▁do ▁not ▁add ▁the ▁feature ▁but ▁find ▁a ▁way ▁to ▁make ▁it ▁easier ▁for ▁a ▁programmer ▁to ▁add ▁the ▁feature ▁them self . ▁Te itel man ▁was ▁also ▁an ▁early ▁pro ponent ▁of ▁the ▁use ▁of ▁email ▁as ▁a ▁multi - task ing ▁feature ▁of ▁the ▁modern ▁computer . ▁ ▁He ▁joined ▁Sun ▁Mic ros ystem s ▁in ▁ 1 9 8 4 ▁and ▁became ▁Sun ’ s ▁first ▁Dist ingu ished ▁Engine er ▁in ▁ 1 9 8 6 . ▁He ▁was ▁also ▁a ▁Director ▁of ▁Multi - Media ▁at ▁Sun ▁until ▁his ▁departure ▁in ▁ 1 9 9 2 . ▁He ▁further ▁worked ▁as ▁Director ▁of ▁Program ming ▁En viron ments ▁for ▁R ational ▁Software ▁and ▁also ▁with ▁Luc id ▁Inc . ▁and ▁Ca ere ▁Corporation . ▁He ▁was ▁one ▁of ▁found ers ▁of ▁a ▁startup ▁called ▁Bay St one ▁Software ▁that ▁developed ▁CR M ▁( Customer ▁Rel ations ▁Management ) ▁software ▁based ▁on ▁Action ▁Request ▁system ▁from ▁Rem edy ▁Corporation . ▁He ▁invent ed ▁the ▁idea ▁of ▁Business ▁R ules , ▁which