Mo Siegel, grew up in Palmer Lake, Colorado. Since his childhood he has loved the outdoors. Mo's entrepreneurial spirit began early when, at 8 years old, he picked wild berries and sold them to neighbors to make jelly. In his teens Mo became a health and exercise advocate and as he says, “a real health food nut.”

Before dropping out of college, Mo attended Western State College in Gunnison and later took classes at the University of Colorado in Boulder . In 1969 he moved to Aspen and worked at Mother's Natural Food Store. It was then, at the age of 19, that he started picking herbs to make tea. 

In 1970 Mo moved to Boulder and, with his wife and friends, he picked herbs and dried them on screen doors. The first batch of 19 bales of tea was delivered to the Green Mountain Grainery, and sold as MO's 36 Herb Tea. This early success lead to the founding of Celestial Seasonings, which was incorporated in 1972.

The tea entrepreneurs set up shop in an old barn outside of Boulder , and expanded their market to stores throughout Colorado , New Mexico and the East Coast. The partners also began buying herbs rather than picking everything themselves, and the dream of a national herb tea company slowly began to materialize.

Devoting his days to creating Celestial Seasonings blends like Red Zinger and Sleepytime , Mo led the company to a successful acquisition by Kraft, Inc., in 1984. Mo stayed with Kraft until 1986 and then returned in 1988 as a Celestial Board member when the company was bought back from Kraft.   He once again became chairman and CEO in 1991. In 2000, Mo oversaw the merger of his company with The Hain Food Group to form The Hain Celestial Group, staying on to oversee the transition between the companies. Assured of Celestial Seasonings leadership position in the herb tea industry, Mo retired in September 2002.

n addition to serving on the board of directors of Celestial Seasonings, Inc., and The Hain Celestial Group, Siegel has served on the boards of among others, Corporate Express, Whole Foods Markets, Wild Oat Markets, Inc., Annie's HomeGrown Foods, Inc., Camelbak Corp., Avid Health Corp., the Boulder Community Hospital and various other non-profit organizations.

Among Siegel's numerous accomplishments include founding the premier international bicycle stage race, the Red Zinger Bicycle Classic, later known as the Coors Classic. He is the co-author of Cooking with Tea and Herbs for Health and Happiness and he has worked extensively with non-profit and humanitarian organizations. In 2005 Mo fulfilled a long-time goal of climbing all of the 14,000-foot mountains in Colorado. Mo has 5 children and 4 grandchildren.