- 1971 B. Eng. in Mathematical Engineering, University of Tokyo.
- 1973 M. Eng. in Mathematical Engineering, University of Tokyo.
- 1980 Dr. Eng. in Mathematical Engineering, University of Tokyo.

- 1973 (April - June) Assistant, Faculty of Engineering, University of Tokyo, Tokyo, Japan.
- 1973-1981 Researcher, Electrotechnical Laboratory, Ministry of International Trade and Industry of Japan, Tsukuba, Japan.
- 1981-1986 Associate Professor, Department of Infromation and Computer Engineering, Nagoya University, Nagoya, Japan.
- 1986-1991 Associate Professor, Department of Mathematical Engineering and Information Physics, Graduate School of Engineering, University of Tokyo.
- 1990-1991 Visiting Associate Professor, Department of Computer Science, Purdue University, West Lafayette, U.S.A.
- 1991-2001 Professor, Department of Mathematical Engineering and Information Physics, Graduate School of Engineering, University of Tokyo.
- 2001-2009 Professor, Department of Mathematical Informatics, Graduate School of Information Science and Technology, University of Tokyo.
- 2009-now Professor, Meiji Institute for Advanced Study of Mathematical Sciences, Organization for the Strategic Coordination of Research and Intellectual Property, Meiji University.

- Voronoi diagrams --- robust construction, generalization, applications.
- Robust implementation of geometric algorithms --- topology-oriented method, exact arithmetic, symbolic perturbation, resolvable representation.
- Computer vision and computer graphics --- interpretation of line drawings, invertible Minkowski algebra, pixcelless image processing.
- Mathematics in visual perception --- optical illusion, anomalous pictures, stereogram,

- K. Sugihara: Interpretation of Line Drawings. MIT Press, Cambridge, 1986.
- A. Okabe, B. Boots and K. Sugihara: Spatial Tessellations --- Concepts and Applications of Voronoi Diagrams. John Wiley and Sons, Chichester, 1992.
- A. Okabe, B. Boots, K. Sugihara and S.-N. Chiu: Spatial Tessellations --- Concepts and Applications of Voronoi Diagrams. Second Edition, John Wiley and Sons, Chichester, 2000.
- A. Okabe and K. Sugihara: Spatial Analysis along Networks --- Statistical and Computational Methods. John Wiley and Sons, Chichester, 2012.
- Other books written in Japanese

- List of papers

- IEEE
- ACM
- Japan SIAM (Japan Society for Indsutrial and Applied Mathematics)
- Information Processing Society of Japan
- IEICE (Institute of Electronics, Information and Communication Engineers)
- Operations Research Society of Japan
- SICE (Society of Instrument and Control Engineers)

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