Dr. Sivasailam "Thiagi" Thiagarajan is the Resident Mad Scientist at The Thiagi Group, an organization with the mission of helping people improve their performance effectively and enjoyably.

Thiagi's long-term clients include AT&T, Arthur Andersen, Bank of Montreal, Cadence Design Systems, Chevron, IBM, Intel, Intelsat, United Airlines, and Liberty Mutual. On a short-term basis, Thiagi has worked with more than 50 different organizations in high-tech, financial services, and management consulting areas. For these clients, Thiagi has consulted and conducted training in such areas as rightsizing, diversity, creativity, teamwork, customer satisfaction, human performance technology, and organizational learning.

Thiagi has published 40 books, 120 games and simulations, and more than 200 articles. He wrote the definitive chapters on simulations and games for ISPI's Handbook of Human Performance Technology, ASTD's Training & Development Handbook, and the American Management Association's Human Resources Management and Development Handbook.