 According to media reports, he started multiple successful businesses before leaving his teens and was sworn into his first public office at age 24.At 28, Mukherji on a ticket with Carmelo Garcia won a six-way Democratic primary election for the Assembly by a 36-point margin in 2013 and won the November general election by a 20-point margin, becoming the second South Asian legislator in state history (after Upendra J. Chivukula).In 2016 and 2017, Mukherji was identified by "POLITICO" as the most prolific lawmaker in the state because of his primary sponsorship of more bills signed into law than any other legislator.