Oscar Marius Nierstrasz
|Born||October 15, 1957|
Laren, the Netherlands
|Citizenship||Canada, Switzerland and Italy|
|Alma mater||University of Toronto|
|Known for||Object-Oriented Reengineering Patterns, Pharo by Example|
|Fields||Computer Science, Programming languages, Object-oriented software design|
|Institutions||University of Toronto, Université de Genève, University of Berne|
|Doctoral advisor||Prof. D. Tsichritzis|
|Doctoral students||Pooja Rani|
- programming languages and mechanisms to support the flexible composition of high-level, component-based abstractions,
- tools and environments to support the understanding, analysis and transformation of software systems to more flexible, component-based designs,
- secure software engineering to understand the challenges current software systems face in terms of security and privacy, and
- requirement engineering to support stakeholders and developers to have moldable and clear requirements.
He has led the Software Composition Group at the University of Bern since 1994 to date (December 2011).
Nierstrasz is born in Laren, the Netherlands. He lived there for three years and then his parents, Thomas Oscar Duyck (1930--) and Meta Maria van den Bos (1936-1988) moved to Canada. He developed an early interest in Mathematics and Computer Science. He pursued his Bachelor studies in the Departments of Pure Mathematics and Combinatorics and Optimization  at the University of Waterloo in 1979. He enrolled for the master studies in the Department of Computer Science at the University of Toronto in 1981. There, he continued for his Ph.D. under the supervision of Prof. D. Tsichritzis. During his postgraduate work in the university, Nierstrasz worked on the `Message Flow Analysis'. He finished his Ph.D. in 1984 and then worked at the Forth Institute of Computer Science in Crete for one year. Since 1985, Nierstrasz has lived in Switzerland. He was a member of the Object System Group at the Center Universitaire d' Informatique  of the University of Geneva, Switzerland (1985-1994). He met there his wife, Angela Margiotta Nierstrasz. They married in May 1994. In late 1994, he moved to Bern, Switzerland to work as a professor.
In late 1994, he joined the University of Bern as a professor and led the software composition group at the University of Bern from 1994 to December 2021. He has also served as a dean of Computer Science Institute (IAM) at the University of Berne. During his career, he supervised 40 Ph.D. students and almost 100 bachelors and masters theses.
He had made various contributions to Software Engineering Research community:
- Nierstrasz co-authored several books such as Object-Oriented Reengineering Patterns and Pharo by Example. He was editor of the Journal of Object Technology from 2010 to 2013, succeeding the founding editor, Richard Wiener.
- CyberChair, an Online Submission and Reviewing System, is based on Oscar Nierstrasz's publication called Identify the champion, where he described the peer review process for contributions to scientific conferences using an organizational pattern language.
His Erdos number is 3. Oscar Nierstrasz — David M. Jackson — E. Rodney Canfield — Paul Erdös
Nierstrasz won the Senior Dahl–Nygaard_Prize in 2013.
- Introduction to Oscar Nierstrasz as a keynote speaker at the European Software Engineering Conference (ESEC/FSE 2005): 
- Laren 
- Serge Demeyer, Stéphane Ducasse, and Oscar Nierstrasz. Object-Oriented Reengineering Patterns, Square Bracket Associates, 2008, 
- Andrew Black, Stéphane Ducasse, Oscar Nierstrasz, Damien Pollet, Damien Cassou, and Marcus Denker. Pharo by Example, Square Bracket Associates, 2009.
- Wiener, Richard (May 2010), "Farewell editorial", Journal of Object Technology, 9 (3): 5, doi:10.5381/jot.2010.9.3.e1
- Nierstrasz, Oscar (January 2013), "Farewell editorial", Journal of Object Technology, 12 (1), doi:10.5381/jot.2013.12.1.e1
- Oscar Nierstrasz, Identify the Champion, In: Pattern Languages of Program Design 4, N. Harrison, B. Foote, H. Rohnert (Ed.), vol. 4, Addison Wesley, 2000, pp. 539-556, http://scg.unibe.ch/download/champion/
- Richard R. van de Stadt, CyberChair - An Online Submission and Reviewing System, or: A Program Chair's Best Friend