Question: Chris Hull has what title given to individuals who have made a "substantial contribution to the improvement of natural knowledge"?

Context paragraphs:
Comer Range: The Comer Range ( ) is a mountain range, 3 nmi long, running southwest to northeast and rising to 600 meters to the west of Harbour Glacier in Wiencke Island, Palmer Archipelago.  From south to north the range includes Jabet Peak and Noble Peak.  Named by the Advisory Committee on Antarctic Names in 2007 after Gary Comer (1927-2006), an American philanthropist and founder of the Lands' End company whose association with polar research stems from his 2001 trip through the Northwest Passage in the vessel "Turmoil".  The ease of his passage in comparison to that of numerous experienced sailors previously convinced him that climate change was occurring.  To research the issue Comer contacted distinguished scientists Wallace S. Broecker, Lamont-Doherty Geological Observatory, and F. Sherwood Rowland, University of California, Irvine, and engaged their help in sponsoring a fellowship/mentorship program that he would fund.  Comer’s investments in climate and environmental change research in the Arctic, and in particular the polar science internship program that he developed and supported, represents a substantial contribution to the advancement of polar science.  The new intellectual capital represented by the cadre of new scientists trained through his internship program has already made substantial contributions to knowledge of the Arctic and this in turn represents a significant contribution to improving the global glacial-geologic and glaciological context that is essential for understanding climate change work in the Antarctic.

Royal Society (disambiguation): The Royal Society (The Royal Society of London for the Improvement of Natural Knowledge), is a society for science in the Unites people ed Kingdom.

Isabelle Stevenson Award: The Isabelle Stevenson Award is a special non-competitive Tony Award.  It is given to "an individual from the theatre community who has made a substantial contribution of volunteered time and effort on behalf of one or more humanitarian, social service or charitable organizations, regardless of whether such organizations relate to the theatre."

International Academy of Sex Research: The International Academy of Sex Research (IASR) is a scientific society for researchers in sexology.  According to John Bancroft, retired director of the Kinsey Institute, IASR "can claim...most of the field's leading researchers."  IASR is unique among sexology organizations in that individuals must be elected to membership, which requires demonstration of substantial contribution to sexology, including the authorship of 10 or more professional publications.  Notable members have included Drs. Ray Blanchard, Milton Diamond, Kurt Freund, Richard Green, Leonore Tiefer, Judith Becker, and Ken Zucker.  The official journal of IASR is the "Archives of Sexual Behavior".

Chris Hull: Christopher Michael Hull FRS is a professor of Theoretical Physics at Imperial College London.  Hull is known for his work on string theory, M-theory, and generalized complex structures. Edward Witten drew partially from Hull's work for his development of M-theory.

List of female Fellows of the Royal Society: Fellowship of the Royal Society is open to scientists, engineers and technologists from the United Kingdom and Commonwealth of Nations, on the basis of having made "a substantial contribution to the improvement of natural knowledge, including mathematics, engineering science and medical science".  Election to the Fellowship is highly regarded and sought after, bringing prestige to both the individual academically and the institution the Fellow is associated with.  For scientists in the United Kingdom, the recognition is considered second only to being awarded the Nobel Prize.

Copley Medal: The Copley Medal is a scientific award given by the Royal Society, for "outstanding achievements in research in any branch of science."  It alternates between the physical and the biological sciences.  Given every year, the medal is the oldest Royal Society medal still awarded, and probably the oldest surviving scientific award in the world, having first been given in 1731 to Stephen Gray, for "his new Electrical Experiments: – as an encouragement to him for the readiness he has always shown in obliging the Society with his discoveries and improvements in this part of Natural Knowledge".

Fellow of the Royal Society: Fellowship of the Royal Society (FRS, ForMemRS and HonFRS) is an award granted to individuals that the Royal Society judges to have made a "substantial contribution to the improvement of natural knowledge, including mathematics, engineering science and medical science".

Yorke Prize: The Yorke Prize is awarded annually by the Faculty of Law at the University of Cambridge for an essay of between 30,000 and 100,000 words on a legal subject, including the history, analysis, administration and reform of law, "of exceptional quality, which makes a substantial contribution to its relevant field of legal knowledge."

Mary Vaughan Jones Award: The Mary Vaughan Jones Award is a Welsh children's literature award.  The "Mary Vaughan Jones Trophy" is awarded every three years to an author who has made a substantial contribution to children's literature over a number of years.  It was established in memory of Mary Vaughan Jones's contribution to the field of children's books in Wales.

Supporting paragraphs: Chris Hull Fellow of the Royal Society
Answer: Fellowship of the Royal Society