Fred Tappert
Encyclopedia
Frederick Drach Tappert was an American physicist whose primary contributions were in underwater acoustics
Underwater acoustics
Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries. The water may be in the ocean, a lake or a tank. Typical frequencies associated with underwater acoustics are between 10 Hz and...

. He is noted for the development of the parabolic equation model and split-step Fourier algorithm for electromagnetic and ocean acoustic propagation.

He began his scientific career in the field of plasma physics, receiving his Ph. D. from Princeton University
Princeton University
Princeton University is a private research university located in Princeton, New Jersey, United States. The school is one of the eight universities of the Ivy League, and is one of the nine Colonial Colleges founded before the American Revolution....

 in 1967 with a dissertation titled "Kinetic theory of equilibrium plasmas".
Tappert studied under the Nobel laureate Eugene Wigner.

He was a member of the technical staff of Bell Telephone Labs from
1967 to 1974. Among his notable accomplishments there was a collaboration with Akira Hasegawa on optical solitons which underpinned later advances in fiber-optic communication
Fiber-optic communication
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information...

 technology.
Following his years at Bell Labs, Tappert was a Senior Research Scientist at the Courant Institute of New York University
New York University
New York University is a private, nonsectarian research university based in New York City. NYU's main campus is situated in the Greenwich Village section of Manhattan...

 from
1974 to 1978. He moved to Coral Gables, Florida, in 1978 to join the faculty of the University of Miami, where he had a joint appointment in the Department of Physics on the main campus and in the Department of Applied Marine Physics at the Rosenstiel School of Marine and Atmospheric Science
Rosenstiel School of Marine and Atmospheric Science
The Rosenstiel School of Marine and Atmospheric Science is a college and research institute for the study of oceanography and the atmospheric sciences within the University of Miami . It is located on a 16 acre campus on Virginia Key in Miami, Florida, USA...

 (RSMAS).
In 2001, he was awarded the Department of the Navy's Superior Public Service Award
Navy Distinguished Public Service Award
The Navy Distinguished Public Service Award, established in 1951, is an award presented by the U.S. Secretary of the Navy to civilians for specific courageous or heroic acts or exceptionally outstanding service of substantial and long-term benefit to the Navy, Marine Corps, or Department of the...

, the citation of which noted, "Professor Tappert's introduction of the parabolic equation propagation model in 1974 started a revolution in the
underwater acoustics modeling community. ... It is, in large part, a tribute to Professor Tappert's superb efforts that today the PE model is the de facto standard full wave propagation model in underwater acoustics and that, in a practical sense, he is thought of as the 'father of the PE model'."
Tappert was posthumously awarded the Pioneer in Underwater Acoustics Medal by the Acoustical Society of America, "for application of the parabolic equation to underwater acoustic propagation."

The 145th Annual Meeting of the Acoustical Society, in 2003, featured a memorial session dedicated to Frederick Tappert on the subject of "Propagation Phenomena and the Parabolic Equation."

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