COPPELL, Texas--(BUSINESS WIRE)--Mannatech, Incorporated (NASDAQ: MTEX), a global pioneer in the development of high-quality health, weight and fitness and skin care solutions based on nutritional science, announced the promotions of Natalie Clark to senior vice president, North America; Gary Spinell to senior vice president, finance and administration; Landen Fredrick to vice president, North American sales; Sandra McLean, PHR, to vice president, human resources; and Matt Rumpsa to vice preside
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