Born and raised in Geneva, Illinois, Larson has been performing improv since she was a teen with such groups as the Second City Alumni and The Groundlings. For the past six years, Larson's primary focus has been writing and producing television. In 1998, Larson joined the writing team of the hit comedy show Dharma & Greg, where she stayed for three years before moving to writing and producing The Drew Carey Show. She is busy raising her daughter Joan and also created and wrote for the short-lived comedy series Are You There, Chelsea? (which guest-starred Ryan Stiles) before becoming an executive producer and writer for the hit Tim Allen comedy show Last Man Standing.