Dr. Yasuhiko Naito is a Japanese scientist who earned his Ph.D. from the University of Tokyo and began his career by working with harbor seals in Hokkaido and north in the Sea of Okhotsk in the 1960s and early 1970s.  He pursued the study of marine mammals when he began at the National Institute of Polar Research in 1978 and is probably best known for his use of animal-borne devices, or ABDs as they are known in the bio-logging scientific circles.