Mr. Rau is the vice president of human resources for Sigma-Aldrich, a $2.2 billion company that develops and produces research chemicals and is headquartered in St. Louis. Mr. Rau is responsible for human resources management for the company's 7,800 employees in 37 countries.

Rapp is a group president of Caterpillar Inc., one of the world’s largest manufacturers of construction, mining, and agricultural equipment. Caterpillar is a Fortune 500 company with annual sales of over $51 billion. Now working at the firm’s headquarters in Peoria, Illinois, Rapp previously served the company in South Africa, Switzerland, and North Carolina.

Jim Weddle is the managing partner of Edward Jones, a leading financial services company based in St. Louis that serves more than 7 million clients. Since joining the company in 1976, Weddle has been an instrumental part of its steady growth. Edward Jones was listed at No. 2 on Fortune magazine’s 2009 list of the “100 Best Companies to Work for.”