response: That's great! Speaking of 7, since 1997 Eric Jacobson has been the primary performer of Bert.
original_response: Mine too! Its been known that since 1977, the muppeteer eric jacobson has been centered as berts performance on sesame street
history: Seven is my favorite number!
knowledge: Since 1997, Muppeteer Eric Jacobson has been phased in as Bert's primary performer, like Grover, although Frank Oz still performs Bert occasionally.