Eichenstein started his career as an aide to political consultant
Ezra Friedlander. From 2011 until 2015, Eichenstein was the senior adviser to
New York State Comptroller Thomas DiNapoli. Eichenstein was considered to be the front-runner in the race, running unopposed as the
Democratic candidate in the primary election in September 2018. as well as by Senator
Charles Schumer, former Senator
Joe Lieberman, and New York City Mayor
Bill de Blasio. Eichenstein has strongly opposed the government mandating secular education in Hasidic schools. In March 2020, Eichenstein co-sponsored a bill promoted by
Pamela Hunter that sought to end driver license suspensions for drivers with unpaid fines, saying: "Without a driver's license, a person cannot drive to work or to school, or even to court to pay their fine... Let's keep our safe and responsible drivers on the roads, instead of being embroiled in needless and wasteful court appearances... This new legislation would represent a victory for all New York drivers." In October 2020, during the
COVID-19 pandemic, Eichenstein said he was "outraged" with the "draconian measures" implemented by Governor
Andrew Cuomo to curb the spread of coronavirus in various neighborhoods of New York City.
Committees Assembly Speaker
Carl Heastie appointed Eichenstein to serve on a number of committees, including Aging, Cities, Housing, Real Property Taxation, and Social Services. Eichenstein serves as Chair of the Subcommittee on Outreach and Oversight of Senior Citizen Programs. == Personal life ==