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Walter Maurice Elsasser (born March 20, 1904, in Mannheim, Germany; died October 14, 1991, in Baltimore) was a physicist and is considered "father" of the geodynamo theory. Long before he became known for his geodynamo theory, while in Göttingen in the 1920s, he has suggested the experiment to test the wave aspect of electrons. This suggestion of Elsasser was later communicated by his senior colleague from Göttingen (Nobel Prize recepient Max Born) to physicists in England. Then followed Davisson-Germer and Thompson experiments later awarded with the Nobel Prize in Physics.

In 1939, Elsasser published the theory that the earth's electromagnetic field is powered by eddy currents at the planet's liquid core.

In his later years, Elsasser became interested in what is now called systems biology and was a founding editor of Journal of Theoretical Biology. The final version of his thoughts on this subject can be found in his book Reflections on a Theory of Organisms, published in 1987 and again posthumously with a new forward by Harry Rubin in 1998.

Elsasser's work is still quite controversial, and in fact sits in an odd relationship to the field of systems biology he helped to found. Central to Elsasser's biological thought is the notion of the astronomical complexity of the cell. Elsasser deduced from this that any investigation of a causative chain of events in a biological system will reach a "terminal point", where the number of possible inputs into the chain will overwhelm the capacity of the scientist to make predictions, even with the most powerful computers. This might seem like a counsel of pessimism, but in fact Elsasser was not calling for the abandonment of biology as a worthwhile research arena, but rather for a different kind of biology where molecular causal chains are no longer the main focus of study. Correlation between supra-molecular events would become the main data source.

Works

• Memoirs of a Physicist in the Atomic Age, (1978)
• The role of individuality in biological theory, (1970)
• Reflections on a Theory of Organisms: Holism in Biology, (1998) Johns Hopkins University Press (JHU).

The Olin Hall at the Johns Hopkins University has a Walter Elsasser Memorial in the lobby.

Web pages

• Extensive biography at The National Academies Press

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