Eljas Soisalon-Soininen

Seppo Sippu is Professor (Emeritus) of Computer Science at the University of Helsinki, and Eljas Soisalon-Soininen is Professor of Computer Science and Engineering at the Aalto University School of Science. They started their co-work already in the 1970s on the area of compiler construction and parsing. This work culminated in the two-volume book "Parsing Theory" published by Springer 1988 and 1990.

Already in the 1980s they gradually moved to data structures and algorithms, and also to databases and indexing, partly inspired by the visit of Dr. Soisalon-Soininen at the University of Karlsruhe as a Humboldt grantee. One important topic in the most recent work has been incorporating index operations into database transactions allowing uniform treatment of them both. Sippu and Soisalon-Soininen have published many articles in peer-reviewed conferences and journals, such as Journal of the ACM, ACM Transactions on Database Systems, The VLDB Journal, and IEEE Transactions on Knowledge and Data Engineering.