▁and ▁F att ▁became ▁president . ▁In ▁ 1 9 5 7 , ▁the ▁firm ▁developed ▁the ▁widely ▁successful ▁" Le aving ▁now ▁for ▁Tr ent on , ▁Philadelphia ▁and ▁C uc am ong a !" ▁campaign ▁for ▁Grey h ound ▁Bus ▁with ▁the ▁tag line ▁" Go ▁Grey h ound ▁and ▁leave ▁the ▁driving ▁to ▁us ." ▁and ▁won ▁the ▁Ford ▁Motor ▁Company , ▁Pro ct er ▁& ▁Gam ble ▁and ▁Ch ock ▁Full ▁o ' ▁N uts ▁accounts . ▁In ▁ 1 9 6 1 , ▁bill ings ▁reached ▁$ 5 9 ▁million ▁and ▁Val en stein ▁became ▁chairman ▁of ▁the ▁executive ▁committee ; ▁F att ▁was ▁named ▁chairman ▁and ▁Stra uss ▁its ▁president . ▁As ▁president , ▁Stra uss ▁pres ided ▁over ▁the ▁national ▁and ▁international ▁expansion ▁of ▁the ▁ag ency . ▁In ▁ 1 9 6 1 , ▁the ▁firm ▁opened ▁an ▁office ▁in ▁Los ▁Angeles ; ▁and ▁in ▁ 1 9 6 2 ▁the ▁firm ▁opened ▁an ▁office ▁in ▁London ▁and ▁in ▁ 1 9 6 3 ▁in ▁Japan . ▁In ▁ 1 9 6 4 , ▁bill ings ▁reached ▁$ 1 0 0 ▁million . ▁In ▁ 1 9 6 5 , ▁the ▁firm ▁went ▁public ▁trad ing ▁on ▁the ▁Nas da q ▁exchange ▁and ▁the ▁firm ▁also ▁expanded ▁into ▁the ▁use ▁of ▁psych ograph ics ▁( the ▁analysis ▁of ▁consumer ▁l ifest yles ). ▁In ▁ 1 9 6 6 , ▁Grey ▁became ▁one ▁of ▁the ▁top ▁ 1 0 ▁ag encies ▁in ▁the ▁U .