Born in Warsaw, a man of Swedish descent. In 1929, Hjalmar Uggla began his scientific career, as a student, at the Department of Soil Science at the University of Agriculture in Warsaw (SGGW), from which he graduated in 1933. Between the years 1935-1939, his work was focused on the classification of soils of Polesie, and later on the soils of Kujawy. The results of his survey were two papers about forests and soils of Polesie (1937) and about alluvial soils of the Horyń river (1939). From 1940 to 1945, H. Uggla worked on a farm in Milanówek, close to Warsaw, where he wrote a monograph about the black earths of Kujawy.
  After the Second World War, he worked at the Department of Soil Science at the University of Agriculture in Warsaw, and his research primarily concerned forest soils. In 1950, he defended his PhD thesis on the soils and sites of the experimental forest station of Rogowo.
  In the same year, he became the head of the Department of Soil Science at the Higher Agricultural School in Olsztyn. In 1954 he gained the title of docent (associate professor) and in 1958 the title of professor. His research work concerned the origin and classification of soils, soil erosion, soil fertility, soil protection and soil cartography. The results of the soil survey include a number of papers and maps. He mapped the soils of Olsztyn Province, as well as parts of Szczecin and Koszalin Provinces. He and his co-workers elaborated the map of soils of north-eastern Poland (1:600 000), the map of Polish soils (1:500 000) and many others.  
  Professor Uggla and his team also prepared a work on “Areas of the north-eastern Poland threatened with water erosion” and monographs “General description of soils of the Mazurian Lakeland” and “The black earths of the Kętrzyn area” (co-author T. Witek).
  Organic soils were an important part of his work, especially gyttja soils (soils formed from lake-bottom sediments). He was the first in Poland who described and evaluated these soils. Additionally, he described the soils formed from the calcareous gyttja as “post-lacustrine calcareous soils”. Many papers were also devoted to Luvisols and sandy rusty soils. During his scientific work, prof. Uggla paid special atttention to forest soils. The results of this are a number of papers and student books. In the 1970s, he focused on protection of forest soils and description of so-called soil reference areas.
  Prof. Uggla was the supervisor of about 200 diploma theses (including 11 PhD theses), he was a member of the International Society of Soil Science and a founder of the Olsztyn Branch of the Polish Society of Soil Science.
  The Council For the Righteous of the World, part of the Yad Vashem memorial institute in Jerusalem, Israel, decided at the session of May 6, 2007 to award to Ludwika and Hjalmar Uggla the medal of Righteous among the Nations as recognition that at risk to their own lives they were saving Jews persecuted during the year of the Nazi occupation.
  Between 1939-1945 the Uggla family lived in Milanówek, a suburban town near Warsaw. They arranged a hiding place in the cellar of their home, where they saved from certain death about 50 Poles, many of them Jews. The decoration ceremony took place in Warsaw, December 16, 2007.
 

Ogólna charakterystyka gleb Pojezierza Mazurskiego [General characteristic of the soils of the Mazurian Lakeland]. 1956. Zesz. Nauk. WSR, Olsztyn, 1: 15-54.
Czarne ziemie Kętrzyńskie [The black earths of the Kętrzyn area]. 1958. Zesz. Nauk. WSR Olsztyn, 3: 69-108 (co-author T. Witek).
Erläuterungen zur neuen Bodenkarte Polens im Masstab 1:100 000. 1958. Cercetari de Pedologie Lucrarils Conferentei de Pedologis. Bucuresti, septembrie 1958. Editura Academiei Republicii Populare Romine: 105-112.
Erläuterungen zum Vorschlag der Systematik der hydromorphen Böden. 1964. Rocz. Glebozn. 14, Supplement: 225-248.
Über die Torf- und Gyttjamurschböden Polens. 1967. Wissenschaftliche Zeitschrift d. Universität Rostok, 16: 105-115.
Gyttjaböden in Nordpolen. 1964. Bucharest, Romania, 8^th International Congress of Soil Science, 5: 619-633.
Untersuchungen über Winderosion mittels des Deflameters D-2. 1964. (co-author H. Piaścik). Bucharest, Romania, 8^th International Congress of Soil Science: 679-689.
Bog and muck soils of the gyttja moorland at Gązwa. 1968. Rocz. Glebozn. 18(2): 369-414. English translation published for the U.S. Department of Agriculture and National Science Foundation, Washington, D.C. by the Foreign Scientific Publications Department of the National Center for Scientific, Technical and Economic Information, Warsaw, Poland, 1973.
Einfluss der Murschprozesse auf die Eigenschaften der Humusstroffe in Gyttjaböden. 1968. Rocz. Glebozn 19, Supplement (co-author Z. Mirowski): 149-161.
Über einige Eigenschaften des Humus in Kiefernwaldböden. 1968. Rocz. Glebozn. 19, Supplement.

Erläuterugen zur neuen Bodenkarte Polens im Massetab 1:500 000. 1970. Beiträge zur Bodensystematik unter besonderer Berücksichtigung reliktischer und rezenter Markmale. nr 102, Berlin (co-author B. Dobrzański): 159-163.
Micromorhology of gyttja muck soil of Jawty Małe. 1972. Zesz. Probl. Post. Nauk Roln. 123 (co-authors Z. Róg, T. Wocławek): 481-489.
Dinamika obsychania szimanija i smačiwanija wodoj muršewych počw obrazowannych iz detritnoj gittii. (in Russian). 1974. Rocz. Glebozn. 25, Supplement (co-author T. Wocławek): 197-206.
Böden in verschiedenen Standrotsverhältnissen. 1974. Transaction of the 10th International Congress of Soil Science, VII, Moscow (co-authors Z. Ferczyńska, Z. Róg): 228-238.
„Rędziny" Pojezierza Mazurskiego. [Rendzinas in the Mazurian Lakeland]. 1976. Rocz. Glebozn. 27(2): 113-125.
Waldbodengesellschaften in einigen Kleinlandschaften des Masurischen Seengebiets. 1977. Proceedings of the Symposium “Soil as a Site Factor for Forests of the Temperate and Cool Zones”. September 5-7, 1977, Zvolen, Vol. 1, Working group ”Forest Soils” of the International Society of Soil Science (co-author Z. Ferczyńska-Uggla): 222-235.

Gleboznawstwo leśne z zarysem geologii, mineralogii i petrografii [Forest soil science with the basis of geology, mineralogy, petrography]. 1955. PWRiL, Warszawa.

Gleboznawstwo leśne ogólne [General forest soil science]. 1966. PWRiL, Warszawa (co-author A. Musierowicz).

Gleboznawstwo leśne szczegółowe [Detailed forest soil science]. 1965. PWRiL, Warszawa.

Gleboznawstwo rolnicze [Agricultural soil science]. 1975. PWN, Warszawa.

Gleboznawstwo leśne [Forest soil science]. 1979. PWRiL, Warszawa (co-author Z. Uggla).