He was a Doctor of Sciences (1980), Professor at the Lomonosov Moscow State University, Honored Scientist of the Russian Federation (1996).

[2] Disciple of Oleg Gazenko, Grigoriev was one of the leading scientists in bioastronautics and space flight medicine.

[3] In 1966, Grigoriev graduated from the Russian National Research Medical University.

[3] Grigoriev was a student of Academicians V. V. Parin [ru] and Oleg Gazenko.

Grigoriev was also Editor-in-Chief of the Aviakosmicheskaya i Ekologicheskaya Meditsina, and the author of more than 500 scientific papers.