Challenges for Leadership in a Multicultural, Global Society...Dr. Gary Weaver, Executive Director, International Management Institute, American University. Dr. Weaver's talk focused on challenges of leadership and today's leaders' need for new skills, sensitivities and approaches in light of increasing globalization, diversification, and multiculturalism. Dr. Weaver has more than 33 years of experience as a member of the faculty of the School of International Service in the Division of International Communication at American University. In 1999, he founded the university's International Management Institute (IMI), a program for training executives for international relocation and multicultural management.