Which of the authors of "Welcome to the Universe: An Astrophysical Tour" advocated for the Doomsday Argument?
Welcome to the Universe: Welcome to the Universe: An Astrophysical Tour is a popular science book by Neil deGrasse Tyson, Michael A. Strauss, and J. Richard Gott, based on an introductory astrophysics course they co-taught at Princeton University. J. Richard Gott:  He is known for developing and advocating two cosmological theories: Time travel and the Doomsday argument.
J. Richard Gott