Ranked Among Best Employers
DDI named to Forbes 2025 America's Best Employers list
Better Leaders. Better Future.
Get to know everything about DDI, a global leadership consulting firm that helps you hire, promote, and develop exceptional leaders. From first-time managers to C-suite executives, our commitment is to be by your side to help you make every moment of leadership count.
Innovation as a Principle
Why Work With Us?
At Development Dimensions International®, we’re innovators at heart. We've spent the last half-century developing scientifically grounded solutions that make a real difference in the world of leadership. From 1970 to now, our ever-expanding portfolio of services, programs, and software innovations continues to shape the lives of leaders and their teams.
We’ve achieved this goal by being by the side of our clients to help them create and implement incredible leadership programs that deliver top results. From the first hello to measuring results, we commit ourselves to making your success, our success.
The Solutions You Need
Why You Need Us By Your Side
Industry Leaders
Meet Our Leadership Team
Tacy M. Byham, Ph.D.
Chief Executive Officer
As DDI's 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.
David Tessmann-Keys
President
President David Tessmann-Keys is responsible for developing and executing DDI’s global business strategy and leading all components of the company’s global operations across the Americas, EMEA, Greater China, and Asia Pacific.
William C. Byham, Ph.D.
DDI Founder and Executive Chairman
Bill is Cofounder and Executive Chairman of DDI and works to establish the vision, values, and strategic direction of the company. He supervises major DDI product development and consulting projects.
Patsy Tsao
Senior Vice President and Chief Financial Officer
Patsy is responsible for the administrative, financial, and risk management operations of the company worldwide.
Kelli Buczynski
Chief People Officer
Kelli is responsible for the execution of DDI’s people and culture strategy around the world.
Julie Simmons
Chief Information Officer
As Chief Information Officer, Julie Simmons leads DDI's global technology strategy for its suite of leadership products as well as its internal data and systems infrastructure.
Jazmine Boatman, Ph.D.
Senior Vice President, North America and European Operations
Jazmine believes passionately in the mission of building better leaders and is responsible for the business strategy and execution for DDI’s U.S. market.
Mindy Yeh
Senior Vice President, Asia
Mindy leads DDI's business strategy and operations in the Greater China region, including Hong Kong, Mainland China, and Taiwan.
Steve Runkel
Sr. VP, Global Sales Strategy & Marketing
Steve plays a key role in developing DDI’s international sales and go-to-market strategy, as well as leading DDI’s U.S. sales team.
Joni Murello
Vice President, General Counsel
Joni manages all DDI’s legal, regulatory, and contractual compliance globally.
Verity Creedy
Sr. VP, Product
As an SVP of Product with two decades of expertise in the HR industry, Verity thrives on transforming customer insights into strategic product developments. Verity's commitment to understanding customer needs allows her teams to build solutions that not only meet expectations but also elevate the leader's experience.
Proud of Our Clients
We are deeply proud to work alongside the leaders in many of the world’s most influential companies.
“My first day back in the office I got to use the training that we learned, and guess what? It worked like a charm!”
-program participant, Progressive
“When they started hearing about our program, they asked ‘When can we do this? How do we get the DDI materials? How do we get certified?”
Brad Grider, Global Labor and Non-Governmental Organizational Relations and Global Learning
“it’s been fascinating seeing employees come out of the experience feeling like ‘That was really cool!”
Kayla Campbell, Senior Director Performance and Learning, Pernod Ricard
“Hiring can be an expensive mistake…You only have a limited time to make this very important decision.”
David Crawford, Vice President and Head of Talent Acquisition, NewYork-Presbyterian
"When you provide a novel source of feedback, it can steepen the learning curve and accelerate development."
Jana Reddin, Ph.D., Sr. Director Worldwide Talent Development, Texas Instruments
“We had a pretty good view about the knowledge, experiences and personal attributes of our candidates, but when asked, ‘What are they capable of?’ that’s where we really needed DDI’s insight.”
Bill Lambert, board member and former CEO, MSA Safety
In fact, over the years we've worked with more than 75% of the Fortune 500
Proud of Our Recognition
We’ve had the honor of being recognized as a top leadership company by many of our industry’s top awards for the work we’ve done with our incredible client partners.
Top Leadership Training Company
Training Industry named DDI to its list of Top 20 Leadership Training Companies, 2025
Training Magazine Network Winner
Training Magazine Network Choice Awards winner in Leadership Development and Measurement, Testing & Assessment: 2024
Have a Question?
Frequently Asked Questions About DDI
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Who is DDI?
DDI is a global consulting company that helps organizations hire, promote, and grow great leaders at every level. We combine deep experience with innovative tools to close skill gaps and speed up leader readiness. Our goal is simple: to create real behavior change that drives business success. With DDI, leadership growth isn’t just training—it’s a powerful way to gain a lasting edge.
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What services does DDI provide?
We offer leadership assessment, development, and succession solutions that build strong, future-ready leadership pipelines. Our approach blends data and targeted development to create personalized learning experiences that work for time-strapped leaders. Our Strategic Learning Teams partner with you to make sure your leadership programs deliver business impact. With DDI, you transform leadership into measurable results.
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How long has DDI been partnering with organizations?
DDI has been a leader in leadership development and assessment for over 50 years. We've worked with companies of all sizes, in every industry. Our research-backed methods and strong client partnerships have helped us shape leadership strategies that deliver real business value.
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What is DDI's global reach?
DDI works with organizations all over the world. Our learning formats are designed to adapt to local cultures while staying true to global standards. With a global network of expert consultants, we help multinational companies tackle complex leadership challenges—wherever they do business.
Proud of Our Diversity
Our ability to succeed—to innovate, to meet the needs of our clients, and to be a market leader—depends on the strength of a diverse and inclusive workforce.
We Believe That:
- Better leaders are diverse and inclusive leaders
- A better future is an equitable future
- Success depends on the strength of a diverse and inclusive workforce
We strive to do better, together, each and every day.
Proud of Our Global Culture
We work by the side of our clients around the world. See where our people are closest to you.
Leadership via Communities
Proud of Our Communities
Our communities depend on great leadership. Through our U-SPARK! program, we help create better leaders in the non-profit and community organizations that shape our lives.
Learn More About U-SparkA Culture of Success
Proud of Our People
Our people are the heart and soul of our company. Every time we survey our clients to learn what they value most about working with DDI, we hear the same top answer: They love our people.
