Weaver is a Houston, Texas-based accounting firm with a history that goes back to 1950. Today, the firm has 21 offices, many of which are in Texas; its offices outside the Lone Star State are located in major cities such as Denver, New York City, Boston, Portland, Oklahoma City, Philadelphia, and Washington, DC, among others. Weaver is among the largest 30 accounting firms in the U.S. by annual revenues. It is also the largest independent CPA firm in the Southwest. The firm employs more than 1,500 people and is led by John Mackel, its managing partner and CEO.