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Karl Kellner

Senior PartnerNew York

Brings 30+ years of cross-industry consulting experience, with particular depth in healthcare

Karl is a senior partner at McKinsey based in New York City. He led the New York office for five years between 2015 and 2020, including moving the location downtown to 3 World Trade Center. Karl has more than 30 years of consulting experience and his clients include CEOs, C-suite executives, and board directors. His client service spans multiple industries, from industrials and business services to consumer and financial, though his greatest depth lies within the healthcare sector. His healthcare clients extend across the sector and include health plans, hospitals and provider organizations, pharmaceutical manufacturers and biotech companies, pharmacy-benefit managers, and private equity firms.

Karl is active in the New York City community. He has served on the Board of New York Cares—New York City’s largest volunteer organization—since 2020 and joined the Board of the Woodstock Byrdcliffe Guild, the oldest operating arts and crafts colony in the country, in 2026. In a personal capacity, he led an eight-year partnership with former President Clinton and the Clinton Foundation to create economic opportunity and assist small businesses in Harlem. He was also a multiyear member of the Clinton Global Initiative. He served from 2006 to 2019 on the Board of the New York Foundation for the Arts and received the organization’s Patron of the Arts Award for Philanthropy in 2019.

Karl holds an MBA degree from the Wharton School at the University of Pennsylvania, where he received a Kaiser Family Foundation Scholarship, and a BA degree, magna cum laude, from Oberlin College, where he was both a musician and a history major. At Oberlin, he was awarded the Carrie C. Life Prize for outstanding achievement.

Published Work

Rewiring healthcare payers: A guide to digital and AI transformation,” McKinsey & Company, March 2025

How payers could unlock value by improving transitions of care,” McKinsey & Company, July 2023

Emerging stronger from the crisis: What’s next for regional providers?,” McKinsey & Company, October 2021

What private-equity strategy planners can teach public companies,” McKinsey & Company, October 2016

Education

The Wharton School
MBA, health care management

Oberlin College
BA, history (magna cum laude)