Question: Behind an Australian-American mathematician who has worked in various areas of mathematics and who else is a Romanian child prodigy in mathematics the third youngest gold medalist in IMO history ?

Context paragraphs:
Ömer Cerrahoğlu: Ömer Cerrahoğlu (born 3 May 1995) is a Romanian child prodigy in mathematics.  At the age of , he won a gold medal at the 2009 International Mathematical Olympiad, making him the third youngest gold medalist in IMO history, behind Terence Tao and Raúl Chávez Sarmiento.  Since then, he won three more silver medals at the 2010, 2011 and 2013 IMO's missing the gold by only 1, 2 and 1 points respectively and one more gold medal at the IMO 2012 in Argentina.  He was born in Istanbul from a Romanian mother and a Turkish father and when he was 5 years old, he moved with his family in Baia Mare, Romania.  He currently studies at MIT.

Nairi Sedrakyan: Nairi Sedrakyan (born 1961 in Ninotsminda, USSR) is an Armenian mathematician involved in national and international Olympiads of mathematics, having been the president of Armenian Mathematics Olympiads, the Leader of Armenian IMO Team, jury member and problem selection committee member of International Mathematical Olympiad, jury member and problem selection committee member of Zhautykov International Mathematical Olympiad (ZIMO), jury member and problem selection committee member of the 1st International Olympiad of Metropolises, the president of International Mathematical Olympiad Tournament of the Towns in Armenia.  He has also authored a large number of problems proposed in these Olympiads.  Nairi Sedrakyan is the author of one of the hardest problems ever proposed in the history of International Mathematical Olympiad, 5th problem of 37th International Mathematical Olympiad.  This problem is considered as one of the hardest problems ever, because none of the members of the strongest teams, i.e. National Olympic Teams of the USA, Russia or China has succeeded to solve it correctly.  Moreover, the National Olympic Team of People's Republic of China has obtained a cumulative result equal to 0 points and was ranked the 6th in the final ranking of the countries instead of the usual 1st or 2nd place.  The British 2014 film X+Y, released in the USA as A Brilliant Young Mind, inspired by, Beautiful Young Minds focuses on an English mathematical genius chosen to represent the United Kingdom at the IMO.  In the film this problem is stated to be the hardest problem ever proposed in the history of International Mathematical Olympiad (minutes 9:40-10:30).  Other outstanding results of the author are having 4 problems in the Shortlist of the worldwide selected 27 problems of the 40th IMO (1999) in Romania and having 5 medals winner students in 41st IMO in South Korea, i.e. 2 silver medals and 3 bronze medals.  Moreover, only 1 point was missing for Sevak Mkrtchyan to obtain a Gold Medal (currently he is an assistant professor of mathematics in United States, Sevak received his PhD in mathematics from University of California, Berkley).  Nevertheless, Arthur Barkhoudarian, one of the first students of Nairi Sedrakyan has received a Gold Medal in International Mathematical Olympiad, later on Arthur received his PhD degree in mathematics from Charles University in Prague.  As all winner students were from the same school, where Nairi Sedrakyan was teaching mathematics, the government of the Republic of Armenia gave to the author the title of the best teacher of the Republic of Armenia and he received a special gift from the Prime Minister.

Chloe Kim: Chloe Kim (Korean: 김선, born April 23, 2000) is an elite American snowboarder, currently sponsored by Target.  While being too young to compete in the 2014 Sochi Winter Olympics Kim earned silver in superpipe in the 2014 Winter X Games, coming behind Kelly Clark.  In 2015 Chloe won Gold in the super pipe event in the Winter X Games beating Kelly Clark.  With this win, at age 14, Kim became the youngest gold medalist until she lost this record to Kelly Sildaru who won gold in 2016 at the age of 13.  In the 2016 X Games, she became the first person under the age of 16 to win three gold medals (and thus the first such person to win back-to-back gold medals) at an X Games.  At that year's U.S. Snowboarding Grand Prix, she became the first woman to land back-to-back 1080 spins in a snowboarding competition.  She scored a perfect 100 points, and is believed to be the second rider ever to do so, after Shaun White.

Nicolae Popescu: Nicolae Popescu, Ph.D., D.Phil.  (] ; 22 September 1937 – 29 July 2010) was a Romanian mathematician and Emeritus Professor.  Popescu was elected a Member of the Romanian Academy in 1992.  He is best known for his contributions to Algebra and the theory of Abelian categories.  Since 1964 and until 2007 he collaborated on the characterization of abelian categories with the well-known French mathematician Pierre Gabriel.  His areas of expertise were: Category theory, Abelian categories with Applications to Rings and Modules, adjoint functors, limits/colimits, Theory of Sheaves, Theory of Rings, Fields and Polynomials, and Valuation Theory; he also had interests and published in the following areas: Algebraic Topology, Algebraic Geometry, Commutative Algebra, K-Theory, Class-Field theory, and Algebraic Function Theory.  He published between 1962 and 2008 more than 102 papers in peer-reviewed, mathematics journals, several monographs on the theory of sheaves, and also six books on abelian category theory and abstract algebra.  In a Grothendieck-like, energetic style, he initiated and provided scientific leadership to several seminars on category theory, sheaves and abstract algebra which resulted in a continuous stream of high-quality mathematical publications in international, peer-reviewed mathematics journals by several members participating in his Seminar series.  His book "Abelian Categories with Applications to Rings and Modules" continues to provide valuable information to mathematicians around the world.  His latest contributions have also branched into valuation and number theory.  He has published over 110 original, peer-reviewed articles in mathematics, mostly in category theory, algebraic geometry, and Galois and number theory.

Andrey Markov, Jr.: Andrey Andreyevich Markov Jr. (Russian: Андре́й Андре́евич Ма́рков ; St. Petersburg, September 22, 1903 – Moscow, October 11, 1979) was a Soviet mathematician, the son of the Russian mathematician Andrey Andreyevich Markov Sr, and one of the key founders of the Russian school of constructive mathematics and logic.  He made outstanding contributions to various areas of mathematics, including differential equations, topology, mathematical logic and the foundations of mathematics.

Ionuț Budișteanu: Ionuț Alexandru Budișteanu (born 1 December 1993) is a Romanian child prodigy, known for his prolific activity in the field of Computer Sciences and teleshopping star.  He is the recipient of the 2013 Gordon E. Moore Award, the grand prize of the Intel International Science and Engineering Fair and an Ambassador of the Romanian Tourism.

Tom Schaar: Tom Schaar (born September 14, 1999) is an American professional skateboarder He was the youngest skateboarder to successfully land a "900," which is 2.5 revolutions in the air and the first skateboarder to land a "1080," which is three revolutions.  He became the youngest X Games gold medalist after completing the first 1080 in a competition at the 2012 Asia X Games in Shanghai; youngest Dew Tour champion, and the youngest "Big Air" gold medalist at the Austin X Games.  By the age of 15, Schaar was a five-time X Games medalist.

Ruth Lawrence: Ruth Elke Lawrence-Neimark (Hebrew: רות אלקה לורנס-נאימרק‎ ‎ , born 2 August 1971) is a British–Israeli mathematician and an associate professor of mathematics at the Einstein Institute of Mathematics, Hebrew University of Jerusalem, and a researcher in knot theory and algebraic topology.  Outside academia, she is best known for having been a child prodigy in mathematics.

Terence Tao: Terence Chi-Shen Tao FAA FRS (born 17 July 1975) is an Australian-American mathematician who has worked in various areas of mathematics.  He currently focuses on harmonic analysis, partial differential equations, algebraic combinatorics, arithmetic combinatorics, geometric combinatorics, compressed sensing and analytic number theory.  s of 2015 , he holds the James and Carol Collins chair in mathematics at the University of California, Los Angeles.  Tao was a co-recipient of the 2006 Fields Medal and the 2014 Breakthrough Prize in Mathematics.

Raúl Chávez Sarmiento: Raúl Arturo Chávez Sarmiento (born 24 October 1997) is a Peruvian child prodigy in mathematics.  At the age of , he won a bronze medal at the 2009 International Mathematical Olympiad, making him the second youngest medalist in IMO history, behind Terence Tao who won bronze in 1986 at the age of 10.

Supporting paragraphs: Ömer Cerrahoğlu Terence Tao
Answer: Raúl Chávez Sarmiento