Mannatech Inc.

As Chief Science Officer at Mannatech, Dr. Sinnott oversees the development of Mannatech's innovative product line. Spearheading numerous research initiatives assessing the safety and efficacy of Mannatech's products, he collaborates with researchers worldwide. Dr. Sinnott has held scientific positions in both industry and government over the past 15 years. He is a three-time alumnus from Arizona State University in Tempe, Arizona where he earned a Bachelor's Degree in biological sciences in 1987; a Master of Natural Sciences Degree in 1989; and a PhD in 1995. During his graduate training, Dr. Sinnott's primary focus was plant medicinal chemistry and plant biotechnology. In addition to business endeavors, Dr. Sinnott was instrumental in establishing the science branch of a non-profit educational institution for training economically-disadvantaged students in science-based careers. The program was quickly granted numerous awards by the Department of Education and the U.S. Department of Agricultures and continues to expand its influence.

Stephen D. Fenstermacher joined Mannatech in November 1998 to serve as our Vice President of Accounting and Controller. In October 1999, Mr. Fenstermacher was named Senior Vice President and Chief Financial Officer. Prior to joining Mannatech, Mr. Fenstermacher was a consultant for Kibel, Green, Issa, Inc., a crisis management firm specializing in turnaround strategy and consulting. From April 1995 to October 1997, he served as Executive Vice President and Chief Financial Officer for The Johnny Rockets Group, Inc., a corporate and franchise restaurant chain. From 1991 to 1995, Mr. Fenstermacher served as Chief Executive Officer and Chief Financial Officer for On the Border Cafes, Inc. He was instrumental in the merger of On the Border Cafes, Inc. with Brinker International, Inc. (NYSE symbol EAT). Mr. Fenstermacher received a B.A. degree in Government with a minor in Life Sciences from the University of Notre Dame, in Notre Dame, Indiana, and received an M.B.A. degree in Finance and Accounting from the University of Pittsburgh, in Pittsburgh, Pennsylvania.

Alfredo (Al) Bala is Mannatech’s Senior Vice President, Global Business Development effective October 1, 2007. Al has served as COO Britt Worldwide, LLC, one of the largest independent Amway networking marketing organizations from 1992 to 2006. While with Britt Worldwide, he led the company’s sales and marketing campaigns, training, motivational seminars, development of business support materials, and technology tools. Al also was heavily involved in the launch and re-launch of over 40 international markets that propelled international sales volume to more than $500 million. Al served as manufacturing plant manager for Bose Corporation from 1983 to 1992. He is conversant and/or fluent in more than 13 languages. In addition to more than 20 years of domestic and international experience in network marketing, Al’s proven record includes growing a major direct sales organization to $750 million, reaching more than one million people in 60 countries.

B. Keith Clark joined Mannatech in August 2006 to serve as our Senior Vice President, General Counsel, and Corporate Secretary. Mr. Clark heads the Legal, Ethics, and Compliance Department and is responsible for a wide variety of legal issues and business unit support. Among those responsibilities is ensuring that Mannatech’s activities are conducted in accordance with all applicable laws, regulations, and procedures. The Compliance department is responsible for creating and enforcing policies and procedures for its independent Associates. Prior to joining Mannatech, Mr. Clark served as Senior Vice President and General Counsel from 2004 until August 2006 for Metromedia Restaurant Group, a subsidiary of Metromedia Company, which is one of the largest privately-held companies in the United States with holdings in the hospitality, energy, and telecommunications industries. From 1997 to 2004, Mr. Clark was employed by Pizza Inn, Inc., a publicly-traded international restaurant franchising company (NASDAQ symbol PZZI), and from 2002 to 2004, served as Pizza Inn, Inc.’s Senior Vice President-Corporate Development, General Counsel and Secretary. Mr. Clark received a B.S. degree with honors in Political Science from Texas Christian University in Fort Worth, Texas and received an M.B.A. and his Juris Doctor from the University of Texas at Austin, in Austin, Texas. In addition, Mr. Clark is a member of State Bar of Texas and also serves on the board of directors of several non-profit organizations.

Dr. Stephen Boyd serves as Medical Director and Administrator of Mannatech Inc, Medical Research Department with responsibility for the medical research program and liaison with the health professions. Dr. Boyd completed his B.S. and Ph.D. degrees in Chemistry at the University of Glasgow, Scotland. In 1974 Dr. Boyd graduated with an M.D. degree from the University of Toronto, followed by training in Family Practice. Dr. Boyd has spent fifteen years in medical practice as a Family Physician, both in Canada and the U.S. Dr. Boyd's interest in medicine and research resulted in his recruitment in Canada as Medical Director of Ortho Pharmaceuticals, a Johnson and Johnson Company. Since 1992 he has been involved in the research and development of naturally occurring compounds as therapeutics and nutritional supplements. During this time he has extensively studied the biology and pharmacology of carbohydrates and glyconutrients. In April 2001, at the general meeting of the Society in London, England, Dr. Boyd was honored by being elected a Fellow of The Royal Society of Medicine.

A Professional Bank co-founder, Stan currently serves as an outside director of the bank. Stan is a noted expert in the direct selling industry, owns Frederick Consulting Services and serves as a director for Mannatech, Inc. Previously, he co-founded Cameo Couture, Inc. and Irving National Bank Shares. Stan has received the Direct Selling Association's highest honor, the "Hall of Fame Award" and holds a place in the Direct Selling Education Foundation "Circle of Honor."