Hans M. Thewissen

Ingalls-Brown Professor of Anatomy at Northeast Ohio Medical University

4209 St. Rt. 44, Rootstown, Ohio, United States
Northeast Ohio Medical University
HQ Phone:
(330) 325-6264
Wrong Hans Thewissen?

Last Updated 4/5/2017

General Information

Employment History

Professor, Anatomy and Neurobiology  - The Austen BioInnovation Institute

Professor, Anatomy and Neurobiology  - BioInnovation Institute

Scientist  - NEOMED

Anatomy Teacher  - NEOUCOM

Research Associate In Department of Physical Anthropology  - The Cleveland Museum of Natural History incorporated

Paleontologist  - Duke University

Contributor  - Geotimes


Ph.D.  - 


Founder  - Digital Library of Dolphin Development

Web References  

NSB/Shell Baseline Studies Research Projects | The North Slope Borough

Craig George is working with Hans Thewissen of Northeast Ohio Medical University to find out if there is a way to measure hearing damage in whales

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Hot News of the Year 2012

In the current issue of the Journal of Vertebrate Paleontology, Hans Thewissen, Ingalls-Brown Professor at Northeast Ohio Medical University (NEOMED), and his colleagues review recent studies that have used modern genetic techniques to shed light on fossils, and vice versa.
"It is a very exciting time to be an evolutionary scientist. So many researchers are investigating evolution, either by finding new fossils or by figuring out the genes that underlie changes in evolution. Now it is possible to combine those two fields and go beyond what each field could have accomplished on its own," said Dr. Thewissen. ... Dr. Thewissen says, "For me personally, as someone who has spent most of his life studying fossil whales, it is very exciting to be able to use information from the development of living mammals, and use it to teach me about how whale evolution happened, 50 million years ago.

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Evolution: The Grand Experiment-Official Site | Whale Evolution

Dr. Hans Thewissen, Professor of Anatomy at Northeast Ohio Medical University (NEOMED), is a whale evolution expert.
He is famous for discovering the walking whale Ambulocetus and a nearly complete skeleton of the walking whale Pakicetus (shown in the picture above). It appeared that Thewissen had added whale parts (in this case a blowhole) to the areas where he had no fossil evidence, just as his former professor had done. When Dr. Werner began questioning Dr. Thewissen about the shape of the skull and missing fossil parts, Thewissen retracted the entire blowhole idea even though he had supplied the world's top museums with skeletons having blowholes. Dr. Thewissen had reported seven other whale characters of Ambulocetus, but all of these, according to Dr. Werner, are problematic. "Dr. Thewissen said that the cheekbone of Ambulocetus was 'reduced' as in modern whales and dolphins; but, in fact, the cheekbone of Ambulocetus is larger than the cheekbone of a horse. Finally, according to Dr. Werner, Dr. Thewissen also retracted his statement that Ambulocetus had a key feature, a whale-like ear bone called a sigmoid process. Surprisingly, in our interview, Dr. Thewissen changed his position and suggested that the ear bone of Ambulocetus looked more like a mole rat ear bone. However, Dr. Zhe-Xi Luo from the Carnegie Museum and Dr. Thewissen from NEOMED called the sigmoid process "questionable" and "equivocal."

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