Krzysztof Józef Szajowski

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Krzysztof Józef Szajowski

Professor
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Born (1950-11-23) 23 November 1950 (age 74)
Zwierzyniec, Poland
NationalityPolish
Known for
  • Optimal stopping
  • Game Theory
TitleProfessor of Mathematics
Academic background
Alma materWrocław University of Science and Technology
Theses
  • Selected problems of optimal stopping of a sequence of random variables (PhD) (29th of March 1980)
  • Optimal strategies in games with stopping processes (Habilitation--28 October 1996)
Doctoral advisorStanisław Trybuła
Academic work
DisciplineMathematics
Sub-disciplineGame theory
Institutions
  • Wrocław University of Technology
  • WSB NLU in Nowy Sącz (1998-1999)
  • PWSZ in Legnica (2000-2004)
  • Higher School of Management "Education" in Wroclaw (2005-2008)
Doctoral students
  • Rafał Weron
  • Bogdan Muciek
  • Artur Suchwałko
  • Anna Karpowicz
  • Joanna Jarosz-Nowak
  • Wojciech Sarnowski
  • Marek Skarupski
Main interests
  • Applied Mathematics
  • Game theory
  • Mathematical Statistics
WebsiteHome page
krzysztofszajowski.academia.edu

Krzysztof Józef Szajowski (born November 23, 1950, in Zwierzyniec)[1][2][3] is a Polish mathematician and engineer specializing in the application of mathematics, probability theory, and mathematical statistics to technological problems.[4] He has been affiliated with academic institutions in Wroclaw, Legnica, Świdnica and Nowy Sacz.[5]

Scientific biography

Krzysztof J. Szajowski is a Polish mathematician specializing in probability theory, mathematical statistics, and decision processes.[5] He graduated from Jan Zamoyski High School in Zamość in 1968 and subsequently pursued studies at the Faculty of Fundamental Problems of Technology at Wrocław University of Science and Technology, earning a master's degree in mathematics with honors in 1973.[6]

He completed his doctoral dissertation Selected Problems of Optimal Stopping of a Sequence of Random Variables[7][4] in 1980 under the supervision of Stanisław Trybuła[8][9][10] at the Institute of Mathematics of Wrocław University of Technology. His habilitation based on the defended dissertation Optimal Strategies in Stopping Process Games[11] at the Faculty of Fundamental Problems of Technology had place in 1996. The title was awarded professor of mathematical sciences in 2014.

Szajowski supervised multiple doctoral candidates and held various academic and research positions throughout his career.[7] His academic tenure commenced in 1973 as a trainee assistant at the Institute of Mathematics and Theoretical Physics at Wrocław University of Science and Technology, where he later advanced to the position of assistant professor.[10] Following the completion of his doctoral studies, he undertook research internships at Wrocław University (1989–1990) and TU Delft (1990–1991).[4][7] Between 1998 and 2008, he held professorial positions at multiple institutions, including Wyższa Szkoła Biznesu – National-Louis University (1998–1999), the Institute of Technology PWSZ in Legnica (2000–2004), and the Higher School of Management "Education" in Wroclaw (2005–2008)[12]. In 2005, Szajowski engaged in research and lecturing at Purdue University in the United States. Additionally, he delivered lectures at TU Dresden during the 2004–2005 academic year and served as a docent at the Institute of Mathematics of the Polish Academy of Sciences in 2008–2009.

Academic activity

Didactic Contributions: Krzysztof J. Szajowski primarily teaches engineering students at Wrocław University of Technology, with a focus on students and doctoral candidates of the Faculty of Fundamental Problems of Technology. He delivers specialized lectures on probability theory, operations research, and statistics. Additionally, he authored the instructional material Statistics and Decision Methods.[13]

Organizational Roles: Szajowski held several administrative positions at the Institute of Mathematics, including deputy director (1996–2000) and director (2000–2002). He served as a member of various faculty and institute councils. In the 1990s, he played a key role in the computerization of administrative processes, teaching, and research,[14] and co-chaired the seminar Stochastic Models – Optimization – Game Theory with Andrzej S. Nowak, Tadeusz Radzik, Zdzisław Porosiński, and Anna Jaskiewicz.[15]

Professional Engagements: Long-standing member of the Polish Mathematical Society (PTM),[16] Szajowski has served as treasurer and president of the Wrocław Branch for two terms each, as well as vice-president of the national PTM (2014–2016)[17] and a member of its Board of Directors (2017–2019).[18] He chaired the Mathematics Teaching Committee of the PTM from 2008 to 2014 and actively participates in the International Society of Dynamic Games(ISDG). He served on the ISDG Scientific Council from 2006 to 2010 and also from 2016 to 2022. For more than 25 years, Szajowski contributed reviews for Mathematical Reviews and Zentralblatt für Mathematik.[19]

Editorial Works

From 2012 to 2019, he was Editor-in-Chief of Mathematica Applicanda,[20] served as Deputy Editor-in-Chief of Antiquitates Mathematicae (2015–2020) and is a member of the editorial board of Scientiae Mathematicae Japonicae (formerly Mathematica Japonica). He co-edited two volumes of the Annals of Dynamic Games,[21][22] a series publication of ISDG and a volume of statistical papers.[23]

Academic Achievements

After finishing his studies, Krzysztof Józef Szajowski joined the research efforts led by Barbara Rokowska, and in parallel with the team of Stanislaw Trybula. His first published work focused on estimating the number of orthogonal Latin squaresLatin squares|. His subsequent research was mainly on sequential decision problems, including optimal stopping of random sequences, which was the subject of his Ph.D. thesis. His postdoctoral work expanded to control of stochastic systems, and game theory related to observation and stopping of stochastic sequences.

An important aspect of his research is the detection of distributional changes (known as "disorders") in streams of random variables, using methods derived from optimal stopping theory. He also contributed to adaptive control of linear systems (in collaboration with Trybuła and Porosiński) and hybrid systems (in collaboration with de Koning).[24]

His research provided insights into player communication and the structure of equilibrium strategies in stochastic process controlled games. He developed solutions for multiplayer stopping games using cooperative simple game frameworks (with Yasuda)[25] and models with correlated equilibria (with Ramsey).[26] His work on the structure of optimal stopping moments highlights the challenges of unified solutions, with examples including variations of the secretary problem with non-monotonic objective functions and adaptations of disorder detection problems.

Szajowski also engaged in interdisciplinary research. As part of a central development research project on heavy machinery, he and Wojciech Kordecki developed a novel approach to defining the readiness state of technical devices using graph theory and heterogeneity detection.[27] In collaboration with medical professionals, he contributed to the mathematical modeling of phenomena relevant to angiologists, otorhinolaryngologists, and psychiatrists.

He authored or co-authored over 100 scientific publications,[28][29][19] including academic textbooks in computer science and applied statistics.[30][14][13] Szajowski supervised seven Ph.D. theses on various topics in stochastic process analysis, optimization, and statistics.[7]

Honors and awards

Krzysztof Szajowski was honored with the Golden Badge of Wrocław University of Technology (1998), the Gold Medal for Long Service (2009), the Silver Cross of Merit (1999),[31] and several awards for his scientific, teaching, and organizational contributions by the authorities of Wroclaw University of Technology.[32][1]

He received the Minister's award for his doctorate (1981)[1].

References

  1. ↑ 1.0 1.1 1.2 Szajowski, Krzysztof (2004). Who is who w Polsce : leksykon biograficzny z ok. 13.750 nowymi wprowadzeniami, z ok. 4.550 zmianami i z ok. 24.800 wymienionymi nazwiskami znanych polskich osobistości, częściowo ze zdjęciami. założone przez Ralpha Hübnera (3 ed.). Zug : Who is Who, Verlag für Personenenzyklopädien: Who is Who, Verlag für Personenenzyklopädien. pp. 2531 s. : il., nuty, portr., 22 cm + płyta CD.
  2. ↑ Burak, Marek; Pregiel, Piotr. Tytularni profesorowie Politechniki Wrocławskiej 1945–1967 (PDF). Politechnika Wrocławska. ISBN 978-83-7493-885-3. s. 11,102
  3. ↑ Krzysztof Pikoń; Agnieszka Sokołowska;Krystyna Pikoń; Hanna Bajer, ed. (2005). "Złota Księga Nauk Ekonomicznych, Prawnych i Ścisłych 2005". Wydawnictwo HELION (in polski). ul. Chopina 6, 44-100 Gliwice. p. str. 324. ISBN 83-920014-4-3. Retrieved 2024-05-05.{{cite web}}: CS1 maint: location (link) CS1 maint: multiple names: editors list (link)
  4. ↑ 4.0 4.1 4.2 Szajowski, Krzysztof Józef. "Ludzie Nauki". ludzie.nauka.gov.pl. Retrieved 2025-01-26.
  5. ↑ 5.0 5.1 Pikoń, Krzysztof; Sokołowska, Agnieszka; Pikoń, Krystyna, eds. (2015). "Kronika Nauki Polskiej 2011-2014. Krzysztof Szajowski". zlotaksiega.helion.pl. Kronika Nauki Polskiej (in polski). ul. Kościuszki 1C, 44-100 Gliwice: Mastermedia sp. z o.o. Polski Instytut Biograficzny. p. 182. ISBN 978-83-942601-0-1. Retrieved 2025-01-26.{{cite web}}: CS1 maint: location (link)
  6. ↑ Nowa Nauka Polska. "prof. dr hab. inż. Krzysztof Józef Szajowski". nauka-polska.pl. Ośrodek Przetwarzania Informacji — Państwowy Instytut Badawczy. Retrieved 2025-01-26.{{cite web}}: CS1 maint: url-status (link)
  7. ↑ 7.0 7.1 7.2 7.3 "Krzysztof Szajowski - The Mathematics Genealogy Project". www.genealogy.math.ndsu.nodak.edu. Retrieved 2025-01-26.
  8. ↑ "Stanisław Trybuła - The Mathematics Genealogy Project". www.genealogy.math.ndsu.nodak.edu. Retrieved 2025-01-26.
  9. ↑ Szajowski, Krzysztof Józef (1980) [1980-03-29]. "Dorobek naukowy Politechniki Wrocławskiej (baza DONA). Wybrane problemy optymalnego zatrzymywania ciągu zmiennych losowych(PhD)". dona.pwr.edu.pl (in polski). Wrocław: Politechnika Wrocławska. pp. 83 s. Retrieved 2025-01-26.
  10. ↑ 10.0 10.1 Duda, R.; Weron, A. (2017-09-11). "Wrocławska szkoła matematyczna". Wiadomości Matematyczne. 42 (01). doi:10.14708/wm.v42i01.5047. ISSN 2543-991X.
  11. ↑ Nowa Nauka Polska (1996-10-28). "Krzysztof J. Szajowski. Optimal strategies in games with stopping processes (habilitation)". nauka-polska.pl (in polski). Wrocław: Ośrodek Przetwarzania Informacji — Państwowy Instytut Badawczy. Retrieved 2025-01-26.{{cite web}}: CS1 maint: date and year (link) CS1 maint: url-status (link)
  12. ↑ "Nowa Nauka Polska". archiwum.nauka-polska.pl. Retrieved 2025-03-21.
  13. ↑ 13.0 13.1 Szajowski, Krzysztof (2011). "Statistics and Decision Methods". Control in Electrical Power Engineering. Wrocław: Wrocław University of Technology. p. 221 s. ISBN 9788362098842.
  14. ↑ 14.0 14.1 Szajowski, Krzysztof (1988). Przewodnik operatora IBM-PC/XT/AT (in polski) (2 (1990) popr. i uzup.; 252 s. ed.). Wrocław: Academia Rolnicza. p. 171.
  15. ↑ "Optimization--Stochastic Modelling--Game Theory". wmat.pwr.edu.pl. Retrieved 2025-03-21.
  16. ↑ "Krzysztof Szajowski". www.ptm.org.pl (in polski). 2017. Retrieved 2024-05-09.
  17. ↑ "Komunikat Komisji Wyborczej PTM | Polskie Towarzystwo Matematyczne". www.ptm.org.pl. Retrieved 2025-01-26.
  18. ↑ "Wyniki wyborów w PTM - skład władz Polskiego Towarzystwa Matematycznego w kadencji 2017-2019 | Polskie Towarzystwo Matematyczne". www.ptm.org.pl. Retrieved 2025-01-26.
  19. ↑ 19.0 19.1 "Krzysztof J. Szajowski - Author Profile - zbMATH Open". zbmath.org. Retrieved 2025-03-21.
  20. ↑ "Mathematica Applicanda". wydawnictwa.ptm.org.pl. Retrieved 2025-03-18.{{cite web}}: CS1 maint: url-status (link)
  21. ↑ Nowak, Andrzej S.; Szajowski, Krzysztof, eds. (2005). Advances in Dynamic Games: Applications to Economics, Finance, Optimization, and Stochastic Control. Annals of the International Society of Dynamic Games. Vol. 7. Boston, MA: Birkhäuser Boston. doi:10.1007/b138903. ISBN 978-0-8176-4362-1.
  22. ↑ Breton, Michèle; Szajowski, Krzysztof, eds. (2011). Advances in Dynamic Games: Theory, Applications, and Numerical Methods for Differential and Stochastic Games. Annals of the International Society of Dynamic Games. Vol. 11. Boston: Birkhäuser Boston. doi:10.1007/978-0-8176-8089-3. ISBN 978-0-8176-8088-6.
  23. ↑ Steland, Ansgar; Rafajłowicz, Ewaryst; Szajowski, Krzysztof, eds. (2015). Stochastic Models, Statistics and Their Applications: Wrocław, Poland, February 2015. Springer Proceedings in Mathematics & Statistics. Vol. 122. Cham: Springer International Publishing. doi:10.1007/978-3-319-13881-7. ISBN 978-3-319-13880-0.
  24. ↑ Szajowski, K.; de Koning, W.L. (1993), "Discrete-Time Markovian Jump Linear Systems", Operations Research ’92, Heidelberg: Physica-Verlag HD, pp. 237–241, ISBN 978-3-7908-0679-3, retrieved 2025-02-08
  25. ↑ Christer, Anthony H.; Osaki, Shunji; Thomas, Lyn C. (1997). Stochastic Modelling in Innovative Manufacturing: Proceedings, Cambridge, U.K., July 21-22, 1995. Lecture Notes in Economics and Mathematical Systems. Berlin Heidelberg: Springer. ISBN 978-3-540-61768-6.
  26. ↑ Ramsey, David M.; Szajowski, Krzysztof (2008). "Selection of a correlated equilibrium in Markov stopping games". European Journal of Operational Research. 184 (1): 185–206. doi:10.1016/j.ejor.2006.10.050.
  27. ↑ Kasprzak, Wacław; Weron, A., eds. (1990). Proceedings of the 1989 COSMEX Meeting Stochastic Methods in Experimental Sciences: Szklarska Poreba, Poland, 8 - 14 september 1989. Singapore: World Scientific. ISBN 978-981-02-0178-4.
  28. ↑ Szajowski, Krzysztof (1976). "MathSciNet: Publications list". Retrieved 2024-02-19.
  29. ↑ Szajowski, Krzysztof (1976). "zbMATH: Publications list". Retrieved 2024-02-19.
  30. ↑ Sofronov, Georgy; Szajowski, Krzysztof (2024-10-29). Multiple Stopping Problems: Uni- and Multilateral Approaches (1 ed.). Boca Raton: Chapman and Hall/CRC. doi:10.1201/9781003407102. ISBN 978-1-003-40710-2.
  31. ↑ Prezydent Rzeczypospolitej Polskiej. "Postanowienie Prezydenta RP z dnia 9 września 1999 r. o nadaniu odznaczeń". sip.lex.pl (in polski). Retrieved 2025-03-21.
  32. ↑ Agnieszka Sokołowska-Pikoń; Krzysztof Pikoń; Paweł Pikoń, ed. (2020). "Złota Księga Nauki Polskiej: w 100 rocznicę odzyskania niepodległości". Polski Instytut Biograficzny (in polski). Gliwice: Helion : Mastermedia. p. str. 512. ISBN 978-83-950638-1-7. Retrieved 2024-05-10.{{cite web}}: CS1 maint: multiple names: editors list (link)

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