The hedge-fund CEO is displeased with New York’s new mayor. Photo: Krisztian Bocsi/Bloomberg/Getty Images There’s a good argument to be made that Mayor Zohran Mamdani should not have gone to war with Ken Griffin , the hedge-fund billionaire and one of the wealthiest men on earth. As Mamdani was celebrating a potential agreement in Albany to tax luxury second homes, he cut a widely viewed video that called out Griffin , noting that his $238 million penthouse would be subject to the new tax.