János Stahl

His first job was at the Institute of Industrial Economics and Plant Management (KGM ISZSZI) of the Ministry of Metallurgy and Mechanical Industry, where he worked in the department of Ferenc Rabár, where he worked on the corporate applications of mathematical methods. In 1965, the Central Statistical Office (KSH) established Infelor under the administration of Ferenc Rabár. He joined the new institute, which became one of the cradles of Hungarian computer science. He was a member of the Operations Research Department, later its head; he was introduced to operations research from the lectures of András Prékopa while still at university.

As head of the Operations Research Department, he organized an almost new school: he prepared fresh graduates for new tasks. The topics of his seminars included: linear programming, integer programming, decomposition procedures, production control methods. In these topics, books and articles presenting the latest domestic and foreign results were processed, one could say in the form of a kind of “postgraduate” training.

He defended his PhD thesis entitled "Decomposition procedures derived from the solution of polyhedral games" at the Hungarian Academy of Sciences in 1974. Later, he became a member of the Hungarian Academy of Sciences' Operations Research Committee.

With the reorganization of Infelor, Számki was established in 1975. The population registration system developed within the framework of the State Population Registration Office (ÁNH) project started here became the country's first and largest continuously used state administration on-line database. This project was not easy - among other things - due to the given computer capacity limitations. In typical fashion, he enthusiastically threw himself into planning not only the mathematical but also the practical application task, and then into leading the implementation. He played a significant role in ensuring that Számki successfully solved the task on time and on schedule.

Between 1982 and 1992, he was an associate professor at the Marx Károly University of Economics (MKKE, then BKE), a second-tenure associate professor from 1992 to 1993, and a university professor in 1993.

Between 1992 and 1994, he was the chief mathematician of the State Insurance Supervision. From 1994 to 1997, he was a consultant of OTP – Garancia Insurance, and from 1997, he was the chief mathematician of the Treasury Supervision.

In the last decade of his life, he worked at the Hungarian Financial Supervisory Authority (HFSA). During this time, he taught operations research courses as a professor at the Corvinus University of Budapest (BCE).

Among his nearly 60 publications, several articles deal with the Hungarian pension system.