Takao Nishizeki

Takao Nishizeki (西関 隆夫, Nishizeki Takao, born 1947) is a Japanese mathematician and computer scientist who specializes in graph algorithms and graph drawing.

Education and careerEdit

Nishizeki was born in 1947 in Fukushima, and was a student at Tohoku University, earning a bachelor's degree in 1969, a master's in 1971, and a doctorate in 1974. He continued at Tohoku as a faculty member, and became a full professor there in 1988.[1] He was the Dean of Graduate School of Information Sciences, Tohoku University from April 2008 to March 2010. He retired in 2010, becoming a professor emeritus at Tohoku University, but continued teaching as a professor at Kwansei Gakuin University until March 2015.[2] He was an Auditor of Japan Advanced Institute of Science and Technology from April 2016 to October 2018.


Nishizeki has made significant contributions to algorithms for series–parallel graphs,[3] finding cliques in sparse graphs,[4] planarity testing[5] and the secret sharing with any access structure. He is the co-author of two books on planar graphs and graph drawing.[6]

In 1990, Nishizeki founded the annual International Symposium on Algorithms and Computation (ISAAC).[7]

Awards and honorsEdit

At the 18th ISAAC symposium, in 2007, a workshop was held in honor of his 60th birthday.[7]

In 1996, he became a life fellow of the IEEE "for contributions to graph algorithms with applications to physical design of electronic systems."[8] In 1996 he was selected as a fellow of the Association for Computing Machinery "for contributions to the design and analysis of efficient algorithms for planar graphs, network flows and VLSI routing".[9] Nishizeki is also a foreign fellow of the Bangladesh Academy of Sciences;[10] one of his students and frequent co-authors, Md. Saidur Rahman, is from Bangladesh.

Selected publicationsEdit

  • Nishizeki, T.; Chiba, N. (1988), Planar Graphs: Theory and Algorithms, North-Holland Mathematics Studies, 140, North-Holland, ISBN 978-0-444-70212-8, MR 0941967.
  • Nishizeki, Takao; Rahman, Md. Saidur (2004), Planar Graph Drawing, Lecture Notes Series on Computing, 12, World Scientific, doi:10.1142/5648, ISBN 978-981-256-033-9, MR 2112244.
Research articles


  1. ^ Biography, Tohoku University, retrieved 2015-03-19.
  2. ^ Faculty profile, Kwansei Gakuin University, retrieved 2015-03-19.
  3. ^ Takamizawa, Nishizeki & Saito (1982).
  4. ^ Chiba & Nishizeki (1985).
  5. ^ Chiba et al. (1985).
  6. ^ Nishizeki & Chiba (1988); Nishizeki & Rahman (2004).
  7. ^ a b ISAAC Day 1, Joachim Gudmundsson, dense outliers, December 21, 2007, retrieved 2015-03-19.
  8. ^ 1995 New Fellows, IEEE Japan Section, retrieved 2015-03-19.
  9. ^ ACM Fellow award citation, retrieved 2015-03-19.
  10. ^ Member profile, Bangladesh Academy of Sciences, retrieved 2015-03-20.

External linksEdit