Paul Westphal, Keith Smart and Mike Malone. As mentioned above, Westphal was fired 6-7 games into Jimmer's rookie season which was the lockout shortened season in which he didn't get an actual training camp experience. Keith Smart lasted basically two full seasons after replacing Westphal and then Mike Malone was hired in June 2013 and Jimmer's team option was declined in October 2013, making him expendable.
Now Thibs is his fourth coach in three years.