Personnel: Max Tegmark at Massachusetts Institute of Technology (Professor of Physics)

Note: The source text explicitly confirms all key fields: (1) person is Max Tegmark, (2) organization is Massachusetts Institute of Technology, (3) role is professor of physics, and (4) startDate is 2004. The Career section states 'In 2004, he joined the Massachusetts Institute of Technology's department of physics' and later confirms 'Tegmark is a professor of physics at the Massachusetts Institute of Technology.' All claims in the record are directly supported by the source.