Executive Staff


Joe Assell, President, GolfTEC

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Since the Company’s inception, Joe Assell has provided the leadership and skill necessary to grow GolfTEC to its current level, often at rates eclipsing 50% annually. GolfTEC began with one employee and $90,000 in sales in 1995, and now operates with 500 employees and over $50 million in sales. Mr. Assell oversees multiple divisions within the company including franchising, technology and finance, legal and marketing. Mr. Assell has been recognized with numerous awards including the Denver Business Journal Top 40 under 40, Golfweek Magazine Top 40 under 40, Colorado PGA Teacher of the Year and the 2008 Ernst and Young Entrepreneur of the Year for the Rocky Mountain Region. Mr. Assell serves on the Board of Directors of the Colorado PGA and is on the Associate Board of the Boys and Girls Clubs of Metro Denver. Mr. Assell graduated cum laude with B.B.A. in Marketing from the Professional Golf Management Program at Mississippi State University and won their Young Alumni of the Year award in 2002. Mr. Assell resides in Denver with his wife and two children.

Mark Sidell, President, Gart Properties

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Mark Sidell has been president of Gart Properties since 1999 and is a partner in all of the company’s real estate investments. He is responsible for leading the organization including an aggressive acquisition program and continued execution of niche development opportunities. Prior to joining Gart Properties Mr. Sidell was a principal with Trammell Crow Company where he enjoyed a 13 year career in the Colorado real estate market. Mark serves on the board of several Denver community agencies including the Downtown Denver Partnership, the Allied Jewish Federation of Colorado and the Jewish Community Foundation. He is also an involved member of the Young Presidents Organization, YPO and the International Council of Shopping Centers. Mark is a real estate industry veteran with more than 25 years of experience and holds an MBA in Real estate and Construction from the University of Denver and received his undergraduate degrees in Construction Management and Business Administration from Washington State University. Mark is married with two children.

Alex Gart, Partner, Gart Capital Partners

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Alex manages, sources, and executes private equity transactions. Prior to joining The Gart Companies, Alex was a Vice President at Willis Stein & Partners, a Chicago based middle market private equity firm that has raised over $3 billion across four funds. Alex focused on the firm’s investments in Niche Manufacturing, Telecom Infrastructure and Financial/Business Services. Previously he was an Associate with Morgan Stanley Real Estate Investors and an investment banking analyst with Canaccord Genuity in Boston. Alex holds an MBA from the Graduate School of Business at Stanford University and a B.A in Neuroscience, magna cum laude, from Middlebury College. Alex is a passionate fly fisherman and outdoor enthusiast. He loves spending time with family and his black lab Lucy.