question: What profession has both Ivan Fesenko and Mark Krein held?
answer: mathematician
context: Title: Chartered Institute of Trade Mark Attorneys
  Passage: The Chartered Institute of Trade Mark Attorneys (CITMA) was founded in 1934 as the British professional body for trade mark attorneys.  It received a Royal Charter in 2016 which saw its name change from ITMA.  CITMA is a professional membership organisation with the power to shape law and practice – nationally and internationally, as well as supporting and promoting the trade mark attorney profession.  It has legal responsibility for regulating the profession, which is delegated to the Intellectual Property Regulation Board (IPReg).
  Title: Samuel Manetoali
  Passage: Samuel Manetoali (born January 24, 1969) is a member of the National Parliament of the Solomon Islands.  He represents the Gao/Bugotu constituency in Isabel Province.  He attended Lepi Primary School and then went on to do his secondary education at the prestigious King George Sixth National School in Honiara.  He attended law school at the University of Papua New Guinea and graduated with an LLB degree and further unspecified qualifications from the University of Tasmania and University of South Australia.  Prior to entering politics he worked in the country's Public Solicitors Office, then he worked as a private lawyer and a legal adviser to the Isabel Provincial Government.  He first entered parliament in the 2006 general election and re-elected in the 2010 general election. .  He served as the Solomon Islands' Minister of Police, National Security and Correctional Services in Prime Minister Derek Sikua's Cabinet until May 2009, when he was transferred to the position of Minister for Lands, Survey, and Housing.  Following the 2010 general election, he remained in Cabinet, under new Prime Minister Danny Philip, as Minister for Tourism and Culture.  In this year's (2014) general election which was held on the 19th November, he was voted in again for the third term with a landslide victory.  .  He contested as an independent candidate in last week's election. .  As a lawyer, many people had expected more from him seeing that many world leaders including Barack Obama and Tony Abott are lawyers by profession and he appears to be a potential candidate for the prime minister's post given his experience as a politician (3 terms including the current term) and his noble profession.  His current success in the recent election could be attributed to projects such as mini-fisheries projects that he established in the various villages in his constituency.  He also helped the villages and communities by giving handouts such as roofing irons, outboard motor engines, fiber boats, solar panels, cash money and other form of support as a way to maintain and broaden his support.  He also supported local tourism in his constituency by giving financial help to tourism operators such as on Sigana Island,albeit, tourism is still at its infant stage in his constituency.  His other elixir to maintain his popularity and support is through facilitating and sending Bamboo Bands/groups notably the Hageulu bamboo band overseas for the promotion of tourism and culture for the country and he managed to do that in his capacity as the minister of Tourism and Culture in the Lilo-led government.  He was also instrumental in establishing the Gao-Bugotu Cultural Festival initially held in Huali Village in Gao and in Sepi/Lepi Villages in Bugotu.
  Title: Fesenko group
  Passage: In mathematics, Fesenko groups are certain subgroups of the wild automorphism groups of local fields of positive characteristic (i.e. the Nottingham group), studied by Ivan Fesenko ().
  Title: Ivan Vasilievich: Back to the Future
  Passage: Ivan Vasilievich Changes Profession (Russian: Иван Васильевич меняет профессию , "Ivan Vasilyevich menyayet professiyu " ) is a Soviet comic science fiction film directed by Leonid Gaidai in 1973.  In the United States the film has sometimes been sold under the title Ivan Vasilievich: Back to the Future.  This film is based on the play "" by Mikhail Bulgakov and was one of the most attended movies in the Soviet Union in 1973 with more than 60 million tickets sold.
  Title: Ivan Fesenko
  Passage: Ivan Fesenko (Russian: Иван Борисович Фесенко ; born 1962) is a mathematician working in number theory and other areas of modern mathematics.
  Title: Mark Krein
  Passage: Mark Grigorievich Krein (Ukrainian: Марко Григорович Крейн , Russian: Марк Григо́рьевич Крейн ; 3 April 1907 – 17 October 1989) was a Soviet Jewish mathematician, one of the major figures of the Soviet school of functional analysis.  He is known for works in operator theory (in close connection with concrete problems coming from mathematical physics), the problem of moments, classical analysis and representation theory.
citations: Ivan Fesenko Mark Krein