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Our Management Team

DDI was built from the inside out, not the outside in. Our management team has a long history of entrepreneurship, investing in leadership development infrastructure and products that help our clients be successful and a business philosophy based on values that benefit our clients, our associates and our company equally.

William C. Byham, Ph.D.
DDI Founder and Executive Chairman
Bill Byham is cofounder and executive chairman of DDI. Bill works to establish the vision, values, and strategic direction of the company. He supervises major DDI product development and consulting projects. Read Full Bio
Tacy Byham, Ph.D.
Chief Executive Officer
As DDI Chief Executive Officer, Tacy oversees the organization’s day-to-day operations and is spearheading increased strategic focus on DDI's core of leadership insight and growth. Read Full Bio
Ronald R. Dalesio
President
Ron is heavily engaged in the development and execution of DDI’s business strategy. He also is responsible for client-facing field operations on a global basis, and directs DDI’s worldwide business development process and teams. Read Full Bio
Scott Erker, Ph.D.
Senior Vice President of U.S. Operations
Scott is a multi-disciplinary leader responsible for DDI’s U.S. Operations, client engagement, and the manufacturing vertical strategy. Read Full Bio
Douglas Reynolds, Ph.D.
Senior Vice President, Assessment Technology and Chief Technology Officer
Doug Reynolds leads DDI’s product development and technology groups, which are accountable for the design and implementation of new behavioral and psychological assessments used for workforce selection, career development, and executive succession management. Read Full Bio
David Tessmann-Keys
Executive Vice President
David leads DDI’s operations throughout Asia-Pacific and Europe. He is responsible for sales, marketing, business development, consulting, operations, and financial performance. Read Full Bio
Audrey Smith, Ph.D.
Senior Vice President, Talent Diagnostics Solutions
Audrey Smith is the senior vice president for DDI’s Talent Diagnostic Solutions around the world, and also serves on DDI’s Operating Committee. Her customer-driven thought leadership, extensive experience, and expertise have shaped DDI’s succession, assessment and development offerings across the leadership pipeline. Read Full Bio
Barry Stern, Ph.D.
Senior Vice President, Accelerated Development Solutions
Barry has responsibility for the creation of DDI’s multi-level development solutions across the globe. Read Full Bio
Patsy Tsao
Senior Vice President and Chief Financial Officer
Patsy Tsao is senior vice president and chief financial officer of DDI. She is responsible for the administrative, financial, and risk management operations of the company worldwide. Read Full Bio
Richard S. Wellins, Ph.D.
Senior Vice President
Rich is responsible for our strategic approaches to global marketing, e-commerce, internal knowledge management, and DDI's Center for Analytics and Behavioral Research. Read Full Bio
Robert W. Rogers
President Emeritus
Bob was president and COO of DDI from 1990-2015. In his current role as President Emeritus, Bob applies his deep experience and expertise to consulting with key DDI clients. Read Full Bio

Talk to an Expert: Our Management Team

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+1 (800) 933-4463
+1 (412) 257-0600