Dan Minogue (Playing coach - 1920 and 1921 flags) coached Hawthorn, Carlton, St Kilda and Fitzroy after RichmondAs an aside each of our last 3 premiership coaches have coached at another club.
Tommy, Jewell and now Dimma.
The first two remained lifelong Tigers
Checker Hughes (1932) had three* stints coaching Melbourne (*coached 1 game in 1965) and won four flags there
Percy Bentley (1934) coached Carlton to two flags (1945 and 1947)
All three of them spent more time coaching other clubs than Richmond
Only Capt Blood (1943) didn't coach another team after coaching the tiges to a Premiership