Nathan Cohen, 49, is a physicist, radio astronomer, and innovator, with a broad scope of knowledge proven and applied across many fields. This foundation has provided the perfect opportunity to gain insight into the application of fractals to antennas and electronics. 

He started his academic career, at 17, at Harvard University under Jack Pierce, where he worked as a research assistant on VLF radio propagation and radionavigation (OMEGA). While taking an NSF summer course for high school seniors in physics and astronomy at the University of Iowa, he did research on Jovian decametric emission, and then spent a semester in engineering at Union College (NY) where he worked at the Dudley Observatory on its Fullam radio telescope. In 1974 he attended Brandeis University  (http://pc.astro.brandeis.edu/BRAG/people) as a physics and mathematics major, and he published his first scientific paper, while learning radio astronomy and  interferometry (arrays) under John Wardle, graduating magna cum laude with highest physics honors in 1977.

  Cohen did his graduate work in astrophysics  at Cornell University under Frank Drake and Carl Sagan, where he conducted extensive radio astronomy observing efforts at Arecibo Observatory; NRAO; the VLA; and other facilities. In 1979 he became a Visiting Scholar at MIT, working under Irwin Shapiro on Very Long Baseline Interferometry (note: astronomers call arrays --‘interferometers’). He received his M.S in astrophysics from Cornell in 1982. He conducted thesis work at Haystack Observatory while a graduate research assistant at the Harvard University/ Smithsonian Center for Astrophysics and received his Ph.D. in astrophysics from (http://astrosun.tn.cornell.edu/people/phds.php) Cornell University with extensive work on radio interferometry and gravitational lenses.

  Completing the Grand Tour of the Charles…

Since 1985, Cohen has applied analytical techniques to stock and options trading, both off-floor, and on-floor as an AMEX options trader. He continues trader activities to this day.

In 1987, Cohen joined  Boston University (a hotspot in the development of fractal geometry), where he retired in 2002 after various appointments as a professor of science; engineering; telecommunications; and mechanical engineering, as well as a director of the Science and Engineering, and Engineering Management programs. Cohen played a mentoring  ‘Mr. Chips’ to over 800 students while at BU, teaching them a variety of subjects, especially  mathematics and engineering.

He has taught astronomy; bioastronomy; engineering mechanics; electric circuit theory; signals and systems in telecommunications; process and operations management; history of technology; calculus; differential equations; biology; discrete mathematics; cosmology; and several other courses.

Cohen has also held research positions at Les Houches; NASA JPL; NASA Ames ; NAIC.

In addition to fractal antenna work, among Cohen’s scientific achievements (many shared with colleagues) are: first detailed images of a gravitational lens via VLBI (1983/85); first description of a passive SETI system (later an acknowledged inspiration for SETI@home)(1980); first evidence for high velocity mass ejection from star forming regions (1980); identification of the best means of  interstellar communication in SETI. (polychromatic SETI’s DIPR)(1993/95); identification of the ‘melon’ of odontocetes as a prism for Moire imaging in echolocation (1986); first real-time deconvolution method in medical ultrasound(1990); first use of fractal coding for optimization(1997); first description of ‘aperture engine’ dual use of power collecting/antenna (1998); the analytical solution  of the requirements for frequency invariance in Maxwell’s Equations(1999).

  The Tortuous Path

Cohen built the first bona fide fractal element antenna in 1988. He used the opportunity to  “become his own grad student” and taught himself antenna engineering. He is one of the world’s most innovative antenna designers, now with 16 years of professional experience, and  40 years of practical experience, stemming from his ‘ham’ antenna work over many years.

In 1995, Cohen co-founded Fractal Antenna Systems Inc. (now in Bedford,MA) and has held position as CEO and Chairman; he  is presently Chief Technical Officier. Cohen has also been a principle in HRN Investment (1984-1989) and such start ups as Biologix (1985-1988), and Gensonics(1995-1999). He was also a consultant and principle of the Boston Research Group(1985-1989).

Cohen has published over 80 technical and scientific papers, and two books (‘Gravity’s Lens’, and ‘Mysteries of the Milky Way’ (w/ D. Goldsmith)). He holds 11 patents on ultrasound; real-time deconvolution; image processing; antennas; and fractal engineering. Cohen’s patents as inventor or co-inventor are: 5,111,823; 5,299,577; 5,383,457; 5,784,492; 5,862,269; 6,104,349; 6,127,977; 6,140,975; 6,445,352; 6,452,553; 6,476,766

Cohen’s work has been described in CNN’s Science and Technology Week (1991); Wired On Line (1997); Scientific American (1999); Sky and Telescope (2001); Discover Magazine (1998); Business Week (1997); New Scientist (1998); and many other publications.

Cohen is a member of the IEEE.

Cohen resides in the Boston area with his wife, son, and beloved dog Georgie. In his spare time he is an outdoorsman, hiker,  and professional landscape photographer (with 42 years of photography experience) and powder hound skier, with passable knees and aspirations for mogul-less slopes.

Clearing Storm, Bartlett NH

God Beams, Antelope Canyon ,AZ

Photos © 2001,2002,2003  Nathan Cohen

Tunnel View, Yosemite CA

Below Logan Pass Glacier MT