How did Jim meet Bernie?

[mupcollector1]

I'm just curious in terms of how Jim got his agent Bernie Brillstine because now a days it's so hard to get an agent in the industry because you would need a referral, union, all this formal mombo-jumbo. So I'm just curious if someone meet Jim and referred him to Bernie? I don't remember reading anything like that, only Jim auditioning for Bernie in the 1960s and howing him how Muppets worked in his office.