Thomas Y. Hartley

Sierra Health Services, Inc. provides health care programs. The firm's services include management of indemnity plans, third-party administrative services program for employer-funded health benefit plans and self-insured worker's compensation plans. The company was founded in 1972 and is headquartered in Las Vegas, Nevada.

Southwest Gas Corp. engages in the provision of natural gas services. It operates through the Natural Gas Operation and Construction Services segments. The Natural Gas Operation segment deals with the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. The Construction Services segment through the Centuri Construction Group, Inc., is full-service underground piping contractor that provides utility companies with trenching and installation, replacement, and maintenance services for energy distribution systems, and industrial construction solutions. The company was founded by Harold G. Laub in March 1931 and is headquartered in Las Vegas, NV.

Ameritrade Holding Corp. develops and provides innovative brokerage products and services tailored to meet the varying investing and portfolio management needs of individual investors and institutional distribution partners. The company is headquartered in Omaha, NE.

Deloitte & Touche LLP engages in the provision of audit, advisory, financial advisory, tax, and consulting services. The company was founded on March 7, 1995 and is headquartered in New York, NY.

MediCor Ltd. acquires, develops, manufactures and markets products for medical specialties in the aesthetic, plastic and reconstructive surgery and dermatology markets. Its products include surgically implantable prostheses for aesthetic, plastic and reconstructive surgery and scar management products. Its products are sold worldwide to hospitals, surgery centers and physicians through various distributors and direct sales personnel. The company was co-founded by Donald K. McGhan and James J. McGhan in 1999 and is headquartered in Las Vegas, NV.