Aleksandr Leonidovich Zaitsev is a Russian and Sovietradio engineer and astronomer from Fryazino. He works on radar astronomy devices, near-Earth asteroidradar research, and SETI. Zaitsev is the chief scientist at the Russian Academy of Science's Institute of Radio Engineering and Electronics. He heads the group transmitting Team Encounter's interstellar messages using the Yevpatoria Deep Space Center. Zaitsev is also serving as the SETI League's Regional Coordinator for Russia. Zaitsev's career has focused on three main topics: the theory, the design and implementation of radar devices used in the study of Venus, Mars, and Mercury; near-Earth asteroid radar research; and interstellar radio messaging, his current field of research. He retired in 2013. Zaitsev observed the asteroid 4179 Toutatis in December 1992 using the 70-m Yevpatorian Planetary Radar in Crimea, as a sounding signaltransmitter, and the 100-m radio telescope in Effelsberg, Germany, as a receiver of the asteroid's radar echo. In June 1995, Zaitsev was responsible for initiating the world's first intercontinental radar astronomy experiment; the radar groups participating in this experiment were led by Steven Ostro at JPL, Zaitsev in Yevpatoria, and Yasuhiro Koyama in Kashima, Japan. Ostro's group transmitted and received using the Goldstone site of the Deep Space Network, while Zaitsev received using the Yevpatoria site and Koyama's group received at Kashima. The target asteroid, 6489 Golevka, was later named for the participating observatories. Zaitsev has also conducted work on using radar to determine the composition of asteroids and planetary bodies. Zaitsev supervised the transmission of the 1999 and 2003 Cosmic Calls from Yevpatoria Planetary Radar. Under his leadership, a youth group in Moscow composed and broadcast a 'Teen Age Message to ETI'. Zaitsev proposed three-section structure of interstellar radio messages, coined the acronym METI and the phrase 'SETI paradox', which refers to an apparent "paradox" where two distant civilizations capable of interstellar communication will always remain silent unless one of them contacts the other first, resulting in a deadlock of silence. In 2005, in article "" he suggested that a high technological is not enough for establishing contact with Aliens because appropriate behavior directed to practical realization of sending signals is necessary too. In 2006-2011, Zaitsev was one of the contributors to the
ARTE's German-French TV documentation "Die Außerirdischen" by Christian Schidlowski;
Russian documentary "Overcome the Great Silence" by Vladislav Sidorov,
Dutch documentary "Calling E.T." by Prosper de Roos,
Dutch documentary "Alien Bits" by Prosper de Roos,
