Magnusson Klemencic Associates is an American structural and civil engineering consulting firm with its headquarters in Seattle, Washington. The company has completed projects worth more than $73 billion in 47 states and 51 countries. Significant MKA projects through its history include the World Trade Center, the Columbia Center, Aqua, the Doha Convention Center Tower, and the Olympic Sculpture Park. Magnusson Klemencic Associates was founded in 1923 as the W.H. Witt Company in Seattle. In 1929, Witt died in a railroad crossing accident and the company passed to partners Harold Worthington and George Runciman (who was referred to as “a leading structural engineer in Seattle” ). During this time the firm designed several notable Seattle buildings, including the Joseph Vance Building and the 1223 Spring Apartment Building. After the end of World War II the building industry in the United States picked up and the firm grew in size. In 1955 the firm was renamed Worthington and Skilling, reflecting the addition of John Skilling as a partner. John Skilling, a member of the National Academy of Engineering, remained a partner in the firm for over 45 years. Notable projects under Skilling’s leadership include the World Trade Center, IBM Building, and the Columbia Center. During the design of the World Trade Center the firm maintained offices in Seattle as well as New York City. However, in the early 1980s partner Leslie E. Robertson split the New York City office from the firm to become Leslie E. Robertson Associates.