Keller Williams was founded in 1983 by Gary Keller and Joe Williams in Austin, Texas.
By 1985, their real estate office had grown to over 70 realtors. Then the recession hit and they were down to under 40 realtors in 1986.
In 1991, the company began franchising.
In 1998, the company expands to Canada.
In 2007, the Luxury Homes by Keller Williams program was launched.
In 2008, KW Commercial, a commercial real estate division, was launched.
In 2010, the company announced plans to expand outside North America. In 2012, a franchise office opened in Vietnam.
In 2013, the company announced plans to expand into Germany, Switzerland, Austria, and Turkey.
A May 2018 article in Bizjournal says that Keller Williams has grown so large that they now have 181,000 agents, which is larger than the population of most small cities in the US.
Today, Keller Williams is the largest real estate company in the US and Canada with over 80,000 real estate agents.