Barbara Mintzer-McMahon

Professional Partnerships and Affiliations



CoachSource is the world’s most experienced leadership coaching company.

Coachsource's team of coaches develops highly successful leaders, using programs tailored to fit their objectives as well as those of the organizations they manage. We make hiring and managing coaches easy, while providing all the tools to track results with confidence. We are the recognized experts at what we do. With our guidance you will do more than meet your leadership development goals—you will surpass.


Alexcel group

The Alliance for Leadership Excellence

Alexcel Group is an international alliance of highly experienced consultants and executive coaches who are deeply committed to furthering the development of individual executives, their teams, and their organizations by supplying the very best expertise in talent development.


Executive development associates

35 years of global leadership creating custom executive development programs & ensuring our client's leaders are a competitive advantage


Sloan group international

Sloan Group International works with leaders to develop the competencies and practices that enable them to meet the challenges of the future. Our international network of executive coaches and consultants brings a dynamic, strengths-focused perspective to executive leadership development and culture change.  We are committed to increasing the effectiveness, endurance, and fulfillment of individual leaders and their organizations through work with senior executives, high-potential leaders, and teams. 

Marshall Goldsmith

Marshall’s highly successful approach to executive development and coaching includes a strong emphasis on involvement of stakeholders, implementation of change and follow-through to measure growth in leadership effectiveness. In the end the only thing that counts is leadership growth i.e. leadership (behavior) effectiveness on the job as perceived by stakeholders.

As Marshall puts it: “Leadership Change and Coaching are simple but not easy!” Stakeholder Centered Coaching developed by Marshall Goldsmith is a highly effective, transparent, structured and time efficient process that works.