As a strategic advisor to CEOs, executive teams, and boards of directors, Mark brings deep expertise honed through leading research strategy for Deloitte's Chief Executive Program (2015-2022). His Professor Emeritus status, following over four decades as Graduate Professor of Management at The New School and Parsons School of Design, now enables him to focus exclusively on a diverse client portfolio spanning Fortune 500 corporations, think tanks, philanthropies, non-profits, and startups, while advancing his research on leadership effectiveness.

Mark's insights appear in prestigious publications including Harvard Business Review, MIT Sloan Management Review, and the Journal of Management Consulting. He authored the influential Guiding Growth: How Vision Keeps Companies on Course and the award-winning Mean Men: The Perversion of America's Self-Made Man.

With a Ph.D. from the University of Massachusetts Amherst's School of Management, Mark divides his time between New York City and the scenic Berkshires of western Massachusetts.

Mark was chosen as one of Global Gurus’ “World's Top 30 Management Professionals” for 2024 and 2025.

  • Mark’s diverse entrepreneurial client base includes founders of transformative start-ups in technology, manufacturing, media, education, health care, finance, and marketing. His coaching skills and leadership development programs are engaged by C-level executives across all sectors of the economy, and his development of corporate and nonprofit boards allows them to govern more effectively. In the not-for-profit realm, he has consulted to and led leadership development initiatives for organizations ranging from multibillion-dollar philanthropic game-changers to local community-based social service providers to the world’s largest international NGOs. Much of his work to infuse progressive leadership practices into the NGO and not-for-profit world has been made possible by significant grants from the Ford, Rockefeller, Mott, and Charles H. Revson Foundations, among others.

    A leading authority on Founders’ Dilemma, the strong and often dysfunctional psychological forces that organizational founders experience when they are pressured to step down, Mark has further advanced effective strategies for CEO transitions in the corporate and not-for-profit sectors. He continues to serve as a commentator on CEO personality and behavior across all media platforms.

  • Mark is co-chair of the board of Footsteps, a human rights organization that supports and affirms individuals and families who have left or are contemplating leaving, insular ultra-Orthodox Jewish communities in their quest to lead self-determined lives. He continues to serve on the board of Isabella Geriatric Center after three decades and was Board Chair for ten years. Isabella remains one of the largest not-for-profit continuum-of-care institutions in the Greater New York area.

    Mark also serves on the board of MJHS Hospice and Palliative Care, as well as the Menorah Center for Rehabilitation and Nursing Care.