Who designed Tulsa's BOK Center?

In 2003, Tulsa County voters approved a $535 million Vision 2025 improvements package that included $183 million to construct and arena and renovate the convention center. $141 million went to the arena and $42 million for the convention center.
The arena is bounded by First and Third Streets and Denver and Frisco Avenues. The tallest point of the structure will stand at 165 feet above the plaza level. In addition, the area will have about 530,000 square feet of gross heated space and about 56,000 square feet of gross non-heated space.
Famed architect Cesar Pelli and his firm, Cesar Pelli & Associates, designed this modern, swirling structure.
The new arena is called the BOK Center, and the Bank of Oklahoma will pay a total of $11 million in cash over the next 20 years for the naming rights to the 18,041-seat facility that opened in September 2008.
Source: Tulsa World, February 22, 2008; p. A9; Tulsa World, Oct. 28, 2005; p. A1; Tulsa World, June 3, 2005; p. A12; Tulsa World, Dec. 3, 2005; p. E1.