He is the chairman of the Cabinet of Ministers of the Chuvash Republic since 6 February 2020, and a member of the Central Council of the A Just Russia party since 2020.

His parents, Aleksey Timofeyevich and Valentina Fyodorovna, worked in the collective farm "Marksist" of the Krasnochetaysk region.

Aleksey died at the age of 30 from cardiac arrest on a flight in the fall of 1976, when Oleg began to attend the 1st grade.

During his school years, he went in for sports (he did daily morning jogging, they had weights and dumbbells in the house, which were in the house of his grandfather on his father's side), loved the Chuvash dance, read a lot, worked on the collective farm and in the collective farm yard.

According to the Honored Teacher of the Chuvash Republic M. M. Volkova, her graduate Oleg Nikolaev "studied only with excellent marks.

In the army, he rose to the rank of senior sergeant, deputy platoon commander; received the specialty of radio mechanics of the landing beacon group of the 2nd class.

From August 1991 to 1992, Nikolayev worked in Cheboksary as an assembler for the installation of steel and reinforced concrete structures in the SU-17 of the Monolitstroy Production and Construction Association.

[~ 1] In 1998, at the Chuvash State University named after I. N. Ulyanov, he received a diploma of higher education in the specialty "economic theory" (qualification "economist").

The Grant Commission awarded the first prize to the project, which was implemented by Nikolayev's company, ZAO PSF Telefonstroy: in the late 90s, all television reception systems were replaced with cable television on the basis of the equipment of a German company in Novocheboksarsk; in the city for the first time a network was built, which made it possible to divide frequencies and ensure the reception of a return signal.

He received additional education under the Presidential Program for the training of management personnel for organizations of the national economy of Russia,[~ 2] as well as in the Federal Service of Russia for Insolvency and Financial Recovery under a temporary standard training program for specialists in anti-crisis management in 1999.

In 2000, on the recommendation of the State Duma deputy Anatoly Aksakov, he headed LLC Small Business Leasing Company in Cheboksary, established by CJSC PSF Telefonstroy and the Republican Fund for Small Business Support of the Chuvash Republic,[5] and worked as a director until 2002.

Nikolayev held positions in the ministry until October 2004, after which he moved to the structure of the entrepreneur Vladimir Yermolayev - to OJSC Kontur in Cheboksary as Deputy General Director for Strategic Development.

[5] On 18 September 2016, he participated in the elections to the State Council of the Chuvash Republic of the VI convocation from the regional branch of the "A Just Russia" party.

He was the first number in the single list of candidates of the party,[citation needed] he also ran in the Yadrinsky single-mandate constituency No.

At the same time, on 18 September 2016, Nikolayev was elected member of the State Duma of the VII convocation from the "A Just Russia" party.

In a single-mandate constituency, he took second place with a score of 11.99% after the candidate from United Russia party Leonid Cherkesov had 46.77%.

On 29 January 2020, by the Decree of the President of Russia, Vladimir Putin, Nikolayev was appointed acting Head of the Chuvash Republic, after the dismissal of Mikhail Ignatyev due to the loss of confidence.

[13][14] On 6 February 2020, he took over the duties of the Chairman of the Cabinet of Ministers of the Chuvash Republic, replacing Ivan Motorin in this post.

Yakovlev, where she received the profession of a primary school teacher[19] She worked as a teacher-psychologist at the Cheboksary secondary school № 45; for three years she worked as a responsible producer of the radio station "Your Radio" FSUE GTRK "Chuvashia"; held the position of Deputy Director of Milan - Flowers - Cheboksary LLC.

[18] His father, Aleksey Timofeyevich, worked as a driver on the collective farm "Marksist" of the Krasnochetaysky District of the Chuvash Autonomous Soviet Socialist Republic, died in 1977.

The memorial place is created under the control of Nikolay's brother, Gennady, (born 1949), who was the Honorary Power Engineer of the Chuvash Republic in 1996.

A number of public structures criticize Nikolayev for the fact that, as a deputy of the State Duma, he initiated a bill according to which the study of national languages in the republics of the Russian Federation should be voluntary - at the request of schoolchildren and their parents and not to the detriment of mastering Russian as the state language of Russia.

The head of the Chuvash public association "Border Brotherhood" Yuri Osokin explained that the adoption of the law may lead to the fact that "children will not know their native languages - the basis of their national culture", "the bill is directed against the native languages of the constituent entities of the Russian Federation."

According to the leader of the Communist Party faction in the Cheboksary City Assembly of Deputies Dmitry Yevseyev, if the law is adopted, "it is completely incomprehensible what will happen to the army of school teachers and specialized faculties in pedagogical universities."

Some people argue that with these amendments we infringed upon the national languages, but in fact we protected them by providing 4 hours to study them in the federal part of the educational standard.

According to the newspaper Zavtra: "The new head of Chuvashia is entirely guided by another Chuvash - federal heavyweight Anatoly Aksakov.

"[25] Aksakov, Chairman of the State Duma Committee on the Financial Market, commented to RIA Novosti: “We expect that the republic will begin to demonstrate forward movement in a fairly short time.

[26] Cheboksary journalist Aleksandr Belov noted: "the local authorities were quite jealous of his activities, it was not easy for him to organize meetings with voters, and the heads of enterprises who approached him were sometimes even punished.