The Centre for the Study of Existential Risk (CSER) is a research centre at the University of Cambridge, intended to study possible extinction-level threats posed by present or future technology.
 The co-founders of the centre are Huw Price (a philosophy professor at Cambridge), Martin Rees (a cosmologist, astrophysicist, and former President of the Royal Society) and Jaan Tallinn (a computer programmer and co-founder of Skype).
 CSER's advisors include philosopher Peter Singer, computer scientist Stuart J. Russell, statistician David Spiegelhalter, and cosmologists Stephen Hawking and Max Tegmark.
 Their "goal is to steer a small fraction of Cambridge’s great intellectual resources, and of the reputation built on its past and present scientific pre-eminence, to the task of ensuring that our own species has a long-term future."
Our Mathematical Universe: My Quest for the Ultimate Nature of Reality is a 2014 nonfiction book by the Swedish-American cosmologist Max Tegmark.
 Written in popular science format, the book interweaves what a "New York Times" reviewer called "an informative survey of exciting recent developments in astrophysics and quantum theory" with Tegmark's mathematical universe hypothesis, which posits that reality is a mathematical structure.
 This mathematical nature of the universe, Tegmark argues, has important consequences for the way researchers should approach many questions of physics.
Max Erik Tegmark (born Max Shapiro 5 May 1967) is a Swedish-American cosmologist.
 Tegmark is a professor at the Massachusetts Institute of Technology and the scientific director of the Foundational Questions Institute.
 He is also a co-founder of the Future of Life Institute, and has accepted donations from Elon Musk to investigate existential risk from advanced artificial intelligence.
John G. Taft (born 1954) is an American financier and writer.
 Early in his career he worked as a journalist before entering the investment industry in 1981.
 Early positions with Piper Jaffray and the St. Paul Mayor's Office were followed by roles as CEO of Voyageur Asset Management and Dougherty Summit Securities.
 His unit at Dougherty was later acquired by Dain Rauscher, and Taft began working with Royal Bank of Canada (RBC) when it acquired Dain Rauscher in 2001.
 From 2005 until 2016 Taft was CEO of RBC's U.S. wealth management unit, RBC Wealth Management.
 He is currently chairman of Delaney|Taft LLC, serves as a director of the Columbia Threadneedle Funds and is a senior advisor to Deloitte and Touche LLP.

Question: Who is the  Swedish-American cosmologist advisor at CSER|?
Answer: Max Tegmark