J. G. M. &lsquo\;Hans&rsquo\; Thewissen ha s studied the paleontology\, anatomy\, and embryology of \;whales for more than four decades\, and has traveled the world to study fossil and li ving \;whales.
\nIn Pakistan\, he discovered skeletons of the fi rst \;whales\, Pakicetus and Ambulocetus\, the latter dubbed as the sm oking gun of \;whale \;evolution by Steven Jay Gould. He documente d how dolphin embryos first grow tiny limbs and then\, by switching off so me key genes\, totally lose their hind limbs. His work on the sense organs of extant \;whales on Alaska&rsquo\;s North Coast has implications fo r the management of endangered \;whale \;populations in the Arctic . He has published more than 100 scientific papers\, nine of which in the prestigious journals Science and Nature. He is one of three editors of the Marine Mammal Encyclopedia\, now in its third edition. He also wrote a po pular book on the origin of \;whales\, &lsquo\;The \;Walking \ ;Whales&rsquo\; (University of California Press)\, which was translated in to Korean and Japanese.
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