Gillenwater has overseen Russ Lyon Sotheby’s International Realty, which does over $4 billion in annual sales, since 2012. Active in real estate for 35 years, he first joined the firm in 1994. Lyon, board chair since 2008 when the firm joined Sotheby’s International Realty, is the third generation to lead the firm. Established in 1947, the company is now one of the nation’s top 50 brokerages with more than 900 agents across Arizona.