Autodesk, Inc. is an American multinational software corporation that provides software products and services for the architecture, engineering, construction, manufacturing, media, education, and entertainment industries. Autodesk is headquartered in San Francisco, California, and has offices worldwide. Its U.S. offices are located in the states of California, Oregon, Colorado, Texas, Michigan, New Hampshire and Massachusetts. Its Canadian offices are located in the provinces of Ontario, Quebec, Alberta, and British Columbia. The company was founded in 1982 by John Walker, who was a co-author of the first versions of AutoCAD. AutoCAD is the company's flagship computer-aided design software and, along with its 3D design software Revit, is primarily used by architects, engineers, and structural designers to design, draft, and model buildings and other structures. Autodesk software has been used in many fields, and on projects from the One World Trade Center to Tesla electric cars. Autodesk became best known for AutoCAD, but now develops a broad range of software for design, engineering, and entertainment—and a line of software for consumers.