I am a failed viola player, who is more often asked to play (and teach) violin! I freelance on both instruments, have a flourishing private teaching practice, and dabble in choral conducting.
Training in the Suzuki method has improved my teaching no end, and I am well informed in acoustics and "lutherie". Oh, and I am only 63! Sorry, 64..Dammit, 65! OMG 66! Dear, oh dear, 67! Er,68. Well, actually 69.. Oh no, 70!