The TMT Master Agreement was completed today at a meeting of the TMT Collaborative Board. All representatives of the TMT partner scientific authorities have signed the document. Jun Yan, Director General of the National Astronomical Observatories of China (NAOC) signs the document, surrounded by representatives from the scientific authorities of the TMT partners. From L to R: Ernie Seaquist, Executive Director of the Association of Canadian Universities for Research in Astronomy (ACURA); Eswar Reddy, TMT Board Member from the Indian Institute of Astrophysics; Edward Stone, TMT Board Vice Chair and the Morrisroe Professor of Physics at the California Institute of Technology (Caltech); Masahiko Hayashi, Director General of the National Astronomical Observatory of Japan (NAOJ); Jun Yan, Director General of the National Astronomical Observatories of China (NAOC); Henry Yang, TMT Board Chair and Chancellor of the University of California Santa Barbara.