1968 — Local pros Joe Walser and Ernie Vossler, frustrated at not being able to lure an annual PGA Tour event in Oklahoma City, begin looking for land and funds to build an elite private course worthy of consideration. 1974 — Construction of Oak Tree Golf Club begins. 1976 — Club opens. 1978 — Club hosts Round of Champions, national play day with Hubert Green, Lanny Wadkins, Chako Higuchi and Hollis Stacy. 1979 — Club hosts Round of Champions, national play day with Andy North, John Mahaffey, Nancy Lopez and Stacy. 1980 — Club hosts PGA Cup Matches. 1984 — U.S. Amateur is held at the club and is won by Oklahoma State junior-to-be Scott Verplank. 1988 — 70th PGA Championship is held and draws a record-setting crowd of 140,000 for the week, including 35,365 the final round. Jeff Sluman wins with 12-under-par 272. 1989 — PGA of America grants club the 1994 PGA Championship; the six-year turnaround is the quickest in PGA Championship history. 1991 — Landmark Land Company, Inc., which owns the club, files Chapter 11 bankruptcy; citing ownership and financial uncertainty, the club is released from its commitment to host the 1994 PGA; seven weeks later, the 1994 Championship is granted to Southern Hills in Tulsa. 1992 — Resolution Trust Corp. takes control of the club. 1994 — Members Don Mathis, Walter Duncan, Ran Ricks and Art Swanson purchase club from RTC for $3.5 million. 2000 — PGA Club Pro Championship is held, but putting surfaces are in poor condition; Mathis approaches PGA of America officials about hosting a future major tournament and is told the greens need to be replaced. 2002-2003 — All greens are replaced, 12 new tee boxes are added and several other renovations are made to the course and clubhouse. 2006 — 67th Senior PGA Championship is held. 2008 — Mathis sells club to G. Edward Evans and Oak Tree Golf LLC.