In March 1997, Yumashev succeeded Anatoly Chubais in the powerful position of the Chairman of the Presidential Executive Office.

[9] In 1999, Yumashev allegedly initiated the appointment of Vladimir Putin as prime minister of the Russian Federation.

[10][11][12] News of Yumashev's resignation, in April 2022, from an unpaid post as adviser to Vladimir Putin, became widely known at the end of May 2022.

[13][14][15] Valentin Yumashev is also known as a co-author of two books with Boris Yeltsin: Against the Grain: An Autobiography and The Struggle for Russia.

[18] Yumashev and his second wife Tatyana Yumasheva (daughter of the first president of Russia Boris Yeltsin) own half of the Imperia Tower in "Moscow International Business Center" and half of the business center of "CITY" (49.58% of shares).