Sunyaev, R.A.
...Zeldovich was a scholar of great fame, but the impression of intellectual greatness came from his ability to perceive scientific problems of major importance, and from the powers with which he would address these problems. This was done, of course, with the associated great confidence provided by continued success. References to him by ex-students (including expatriates in the U.S.) showed an aura of quality and integrity that emanated from him. Even students with limited contact with him would still glow from the experience... - G.J. Wasserburg ...Yakov Borisovich Zeldovich was an exceedingly bright star in the firmament of Soviet and world physics and astrophysics... - V.L. Ginzburg