Astrophysicist and cosmologist Ned Wright has pointed out flaws in the model. John David Barrow (born 29 November 1952) is an English cosmologist, theoretical physicist, and mathematician. His model has however been opposed by cosmologist George Ellis and mathematical physicist I. He is remembered as an astrologer, mathematician, cosmologist, Qabalist and Rosicrucian apologist. Eva Silverstein (born October 24, 1970) is an American theoretical physicist, cosmologist, and string theorist. He was also a scientist, cosmologist, mathematician and music scholar. Katherine J. Mack is a theoretical cosmologist and Assistant Professor at North Carolina State University. Michael S. Turner is a theoretical cosmologist, who coined the term "dark energy" in 1998. During this time Sandage was a graduate student assistant to cosmologist Edwin Hubble. Cosmologist Max Tegmark has provided a taxonomy of universes beyond the familiar observable universe. Cosmologist Alan Guth believes humans will in time be able to generate new universes. The first institute was the brainchild of South African cosmologist Neil Turok. In the following episode, "The Hawking Excitation", cosmologist Stephen Hawking appears as a guest star. The play follows Roland, a beekeeper, and Marianne, a cosmologist through their romantic relationship. The final scene of the episode features a short cameo appearance by cosmologist Stephen Hawking.