▁Center ▁in ▁ 1 9 7 0 . ▁In ▁ 1 9 7 2 , ▁Z ames ▁spent ▁a ▁s abb at ical ▁at ▁the ▁Techn ion ▁in ▁Ha ifa , ▁Israel , ▁and ▁in ▁ 1 9 7 4 , ▁he ▁returned ▁to ▁McG ill ▁University ▁to ▁become ▁ ▁a ▁professor ▁and ▁eventually ▁the ▁Mac Donald ▁Chair ▁of ▁Elect rical ▁Engineering ▁until ▁his ▁death ▁in ▁ 1 9 9 7 . ▁ ▁Family ▁Z ames ▁was ▁married ▁to ▁Eva , ▁whom ▁he ▁met ▁in ▁Israel . ▁ ▁They ▁have ▁two ▁sons , ▁Eth an ▁and ▁Jonathan . ▁ ▁Research ▁ ▁Z ames ’ s ▁research ▁focused ▁on ▁im pre cis ely ▁model led ▁systems ▁using ▁the ▁input - output ▁method , ▁an ▁approach ▁that ▁is ▁distinct ▁from ▁the ▁state ▁space ▁representation ▁that ▁domin ated ▁control ▁theory ▁for ▁several ▁dec ades . ▁At ▁the ▁core ▁of ▁much ▁of ▁his ▁work ▁is ▁the ▁objective ▁of ▁complexity ▁reduction ▁through ▁organization : ▁ ▁For ▁the ▁purposes ▁of ▁control ▁design , ▁gross ▁qual itative ▁properties ▁such ▁as ▁robust ness ▁can ▁be ▁analyz ed ▁and ▁predicted ▁without ▁depending ▁on ▁accurate ▁models ▁or ▁synth eses . ▁Mathemat ical ▁analysis ▁provides ▁topological ▁tools ▁that ▁are ▁very ▁well ▁su ited ▁for ▁this ▁purpose , ▁such ▁as ▁compact ness , ▁contra ction , ▁and ▁fixed - point ▁methods . ▁Furthermore , ▁in ▁control ▁design , ▁where ▁there ▁is ▁lots ▁of ▁model ▁uncertainty , ▁it ▁is ▁often ▁more ▁important ▁to ▁be ▁able ▁to ▁gauge ▁qual itative ▁behaviour ▁( rob ust ness , ▁stability