Krzysztof Stanisław Grabowski was born in Warsaw in 1930. Orphaned during the war, he participated in the Warsaw Grey Ranks. After the war, he moved to Sopot, where he completed high school. In 1955, he earned a diploma in communications engineering, followed by a master’s degree in communications engineering from the Faculty of Electrical and Communication Engineering of the Gdańsk University of Technology, specializing in radio engineering. While still a student, he began teaching, first in the Department of Mathematics (1950–1952), then in the Department of Radio Reception Engineering. In 1953, he worked as an engineer at the Kasprzak Radio Works in Warsaw.

In 1961, he defended his doctoral thesis at the Institute of Fundamental Technological Research of the Polish Academy of Sciences (PAN) in Warsaw. His thesis, prepared under the supervision of Professor Józef Lenkowski, concerned parametric amplifiers and mixers. From 1962 to 1967, he was an assistant professor in the Departments of Electronic Systems and Radio Navigation and Ultrashort Wave Technology at the Gdańsk University of Technology. In 1966, he obtained a postdoctoral degree in technical sciences from the Faculty of Communications at the Warsaw University of Technology, specializing in microwave systems. His postdoctoral dissertation summarized his research on the properties of diode amplifiers and parametric mixers.

Five years later, in 1971, he was awarded the title of associate professor of technical sciences. He was awarded the title of full professor of technical sciences in 1981.

He has experience working abroad. He completed a one-year research fellowship at Lehigh University in Bethlehem, Pennsylvania, USA. In 1969, he received a British Council scholarship in the UK. He also completed numerous short-term internships, including in Darmstadt, Toulouse, and Munich. From 1974 to 1976, he was a professor at the Faculty of Electrical Engineering at the University of Mosul (Iraq). From 1981 to 1985, he organized the Faculty of Electronics at the University of Technology in Algiers (Algeria), where he also held a professorship.

From the moment he joined the Gdańsk University of Technology, Krzysztof Grabowski led the organizational transformation. From 1967 to 1982, he headed the Department of Ultrashort Wave Technology, which he transformed into the Microwave Technology Department. In 1968, he became Dean of the Faculty of Electronics at the Gdańsk University of Technology, a position he held until 1971. During his tenure, during an exceptionally difficult period, he thoroughly reformed the faculty and reorganized it into three institutes: the Institute of Electronic Technology, the Institute of Telecommunications, and the Institute of Computer Science. From 1987, he served as long-time director of the Institute of Telecommunications. He developed collaborations with numerous international teams (Ilmenau, Toulouse, Leningrad/St. Petersburg). He retired in 2000.

He has made significant contributions to teaching. He built specializations in radiolocation, microwave equipment, and microwave radiocommunication from scratch and directed their implementation. He developed study programs, established the necessary equipment (for both teaching and research), and developed laboratories. He organized a teaching and research team that achieved some of the best scientific and teaching results at Gdańsk University of Technology and in the country.

He supervised 150 master’s degree holders (many of whose theses received awards in peer and national competitions). He directed a doctoral program in electronics and telecommunications. He supervised 16 Ph.D.s, half of whom defended their theses with distinction. His students include numerous professors.

Krzysztof Grabowski’s scientific work encompassed many aspects of microwave engineering and technology, including: research on semiconductors and their applications in the construction of active systems (parametric mixers and amplifiers, broadband and low-noise transistor amplifiers); computer methods for the analysis, synthesis, and design of linear microwave circuits of any topology, as well as non-reciprocal circuits utilizing the gyrotropic properties of ferrites. He developed technologies for microwave hybrid circuits and the analytical and computer methods for the analysis of multilayer and multiwire waveguides essential for their construction. He also developed microwave metrology, including methods and systems for the automation of multiport microwave measurement.

He has reviewed countless publications in Poland and abroad, doctoral and postdoctoral theses, monographs, and educational books. He has served on numerous scientific committees at national and international conferences, as well as on committees and teams at universities and the Polish Academy of Sciences, and has coordinated national research programs. He has published one book, five monographs, 53 articles and communications in Poland and abroad, and nine teaching papers. He is a co-author of one patent.

For his teaching, research, and organizational achievements, he has received numerous awards and distinctions, including the Knight’s and Officer’s Cross of the Order of Polonia Restituta, the Medal of the National Education Commission, the gold “Meritorious Communications Employee” badge, the ZSP Honorary Badge, and the Professor Mieczysław Pożaryski Medal of the Association of Polish Teachers (SEP). In 2015, he was awarded the title of Honorary Professor Emeritus of Gdańsk University of Technology.