Leonty Filippovich Magnitsky (Russian: Леонтий Филиппович Магницкий ), born Telyatin (Russian: Телятин ), (June 9, 1669, Ostashkov – October 19, 1739, Moscow) was a Russian mathematician and educator.
In mathematics, the Gromov product is a concept in the theory of metric spaces named after the mathematician Mikhail Gromov.
 The Gromov product can also be used to define "δ"-hyperbolic metric spaces in the sense of Gromov.
In mathematics, the Bishop–Gromov inequality is a comparison theorem in Riemannian geometry, named after Richard L. Bishop and Mikhail Gromov.
 It is closely related to Myers' theorem, and is the key point in the proof of Gromov's compactness theorem.
In mathematics, Gromov–Hausdorff convergence, named after Mikhail Gromov and Felix Hausdorff, is a notion for convergence of metric spaces which is a generalization of Hausdorff convergence.
Open Problems in Mathematics is a book, edited by John Forbes Nash Jr. and Michael Th.
 Rassias, published in 2016 by Springer ().
 The book consists of seventeen expository articles, written by outstanding researchers, on some of the central open problems in the field of mathematics.
 The book also features an Introduction on "John Nash: Theorems and Ideas", by Mikhail Leonidovich Gromov.
 According to the editors’ Preface, each article is devoted to one open problem or a “constellation of related problems”.
Mikhail Leonidovich Lozinsky (Russian: Михаил Леонидович Лозинский, 20 July 1886 – 31 January 1955) is deemed to be the most accomplished Russian translator of the 20th century.
 "In the difficult and noble art of translation," said Anna Akhmatova, "Lozinsky was for the twentieth century what Zhukovsky was for the nineteenth."
 Lozinsky's granddaughters include writers Tatyana Tolstaya and Natalia Tolstaya.
Mikhail Leonidovich Slonimsky (Russian: Михаи́л Леони́дович Слони́мский ; 1 August [O.S. 20 July] 1897 – 8 October 1972) was a Soviet writer, member of the Serapion Brothers group.
Mikhail Leonidovich Bogdanov (born 2 March 1952 in Moscow) is a Russian diplomat.
Mikhail Leonidovich Gromov (also Mikhael Gromov, Michael Gromov or Mischa Gromov; Russian: Михаи́л Леони́дович Гро́мов ; born 23 December 1943), is a French-Russian mathematician known for work in geometry, analysis and group theory.
 He is a permanent member of IHÉS in France and a Professor of Mathematics at New York University.
In Riemannian geometry, Gromov's (pre)compactness theorem states that the set of compact Riemannian manifolds of a given dimension, with Ricci curvature ≥ "c" and diameter ≤ "D" is relatively compact in the Gromov–Hausdorff metric.
 It was proved by Mikhail Gromov in 1981.

Question: Leonty Magnitsky and Mikhail Leonidovich Gromov, were Russians of which common occupation?
Answer: mathematician