John Liu holds a robust academic background, having graduated from Bronx High School of Science and earned a degree in Mathematical Physics from Binghamton University. He gained early leadership experience as the executive vice president of the university's Student Association. His professional journey includes significant roles in both the private sector and public service, such as managing institutional risk in high-finance and leading civic associations. Liu's public sector career was marked by his pioneering role as the first Asian American to win legislative office and citywide office in New York. His tenure in the New York City Council was characterized by securing funding for community projects and enacting progressive legislation. As the 43rd Comptroller of New York City, Liu implemented fiscal reforms, increased pension assets, and promoted transparency in government spending. Currently, he imparts his expertise by teaching municipal finance and public policy at CUNY and Columbia University.

John Liu's political identity is marked by a unique blend of fiscal responsibility and social justice advocacy, often advocating for economic policies that narrow the wealth gap while fiercely opposing discriminatory practices. His legislative efforts frequently bridge seemingly opposing factions, such as his surprising alignment with industrial interests on environmental regulations. Liu’s rhetorical style emphasizes transparency and accountability, as evidenced by his creation of “CheckbookNYC.com” and his relentless exposure of financial irregularities.