Jaffe, David B.
- Whitehead Institute/MIT Center for Genome Research. Computational biology. Coding theory database and links.
- http://www.math.unl.edu/~djaffe2/

Akhil Jain
- Personal page of a University of Chicago Financial Mathematics Graduate.
- http://home.uchicago.edu/~jaina2/

Huiqiang Jiang
- Research interest: partial differential equations, calculus of variation, and geometric measure theory.
- http://www.math.umn.edu/~hqjiang/

Jorgenson, Jay
- Includes profile and research interests.
- http://www.sci.ccny.cuny.edu/math/people/faculty_Staff/jorgenson/jorgenson.html

Johnson, Bob
- UK mathematician providing material on mathematics courses and research including Fibonacci numbers and chaos theory.
- http://www.dur.ac.uk/bob.johnson/

Junichi Yananose
- Mechanical puzzles and transformable polyhedra.
- http://www.ne.jp/asahi/j/yananose/zindex.html

Juno and her Peacocks
- A site about math; graduate and professional life; interesting anomalies; resources and links to things mathematical such as Math Camp.
- http://www.marypat.org/