Massachusetts Institute of Technology | United States Army Corps of Engineers | industrial | California Institute of Technology | Royal Engineers | Art Institute of Chicago | Institute for Advanced Study | American Institute of Architects | Georgia Institute of Technology | United Nations Industrial Development Organization | Industrial music | Rensselaer Polytechnic Institute | Industrial Revolution | Rochester Institute of Technology | Franklin Institute | Royal Institute of Technology | Pasteur Institute | Institute of Contemporary Arts | Industrial Workers of the World | Commonwealth Scientific and Industrial Research Organisation | California Institute of the Arts | Institute of Electrical and Electronics Engineers | industrial music | British Film Institute | Pratt Institute | National Cancer Institute | American Society of Civil Engineers | Virginia Military Institute | Cato Institute | Australian Institute of Sport |
Leon is a member of the Association for Computing Machinery (ACM), the Institute of Electrical and Electronics Engineers (IEEE), the IEEE Computer Society, the Institute of Industrial Engineers (IIE), the Modern Language Association (MLA), the Computer Assisted Language Instruction Consortium (CALICO), the Indian Institution of Industrial Engineering (IIIE), and the Computer Society of India (CSI).
Among the organizations that are members (as of November 15, 2006) include the American Association for the Advancement of Science, the American Chemical Society, American Oil Chemists' Society, the American Society for Microbiology, the American Society for Quality, the American Society of Civil Engineers, the Institute of Food Technologists, the Institute of Industrial Engineers, the National Academy of Engineering, Sigma Xi, and Tau Beta Pi.