Title: Hans Holtedahl
Content:  Hans Holtedahl (8 December 1917 &ndash; 24 February 2001) was a Norwegian geologist. He was a professor of geology at the University of Bergen.
Title: Olaf Holtedahl
Content:  He married Tora Gurstad in 1912. Their children include Professor of geology Hans Holtedahl (1917–2001).
Title: Hans Holtedahl
Content:  He was born in Krisitania (now Oslo, Norway) a son of geologist Olaf Holtedahl (1885–1975) and Tora Gurstad (1889–1980). In 1936, Holtedahl began studying chemistry and zoology at the University of Oslo. In 1939, he joined a research expedition to Antarctica. Following the German occupation of Norway during spring 1940, he went to Great Britain. He became part of a Norwegian field unit in support of the Free Norwegian forces. Given six months leave  in Edinburgh, he  studied geology  under geologist  Arthur Holmes (1890–1965) at the University of Edinburgh. In 1948 he took a master's degree at the University of Oslo and in 1957 he received his doctorate from the University of Bergen. He worked for the University of Bergen from 1949, and was appointed professor of Quaternary geology from 1967, and professor of marine geology from 1972. His doctor thesis treated the geomorphology and sediments on the continental shelf off the coast of Møre. He published a work on the geology of the Hardangerfjord in 1975. In 1952, Hans Holtedahl was honored by the Norwegian Geological Society with the Reusch Medal.
Title: Olaf Holtedahl
Content:  Olaf Holtedahl was born in Kristiania (modern-day Oslo), Norway, the son of Arne H. Holtedahl, superintendent of pauper administration, and his wife, Mathilde Madsen. Around 1903 he did his obligatory military service at Gardermoen, just north of Oslo, and here met Captain Gunnar Isachsen who greatly influenced him, and first inspired his interest in polar regions. In 1909, Isachsen invited Holtedahl to join him in explorations of Spitsbergen as official geologist of the group. He studied Geology at the University of Oslo, graduating in 1909 and receiving a doctorate in 1913. Staying in the university as staff he received his professorship in 1920. Holtedahl was among the last of a generation of geologists that mastered the subject in all its breadth. He delivered 
Title: Hans Holtedahl
Content:  During his studies in Edinburgh, he met the philology student Wendy Moira Lowe (1923–1978), who he married in 1946 and with whom he had three children.
Title: Hans Huitfeldt Riddervold
Content:  Hans Huitfeldt Riddervold (16 October 1927 – 26 July 1980) was a Norwegian media executive. He was born in Kristiania as a son of newspaper manager Hans Julius Riddervold (1901–1986) and Cathrine Huitfeldt. He was a paternal great-great-grandson of politician Hans Riddervold, He was a nephew of editor Henrik Jørgen Schibsted Huitfeldt. He was married to Tove, née Baumann. He took his examen artium in 1946, and took a bookprinter's apprenticeship in Grøndahl & Søn from 1947 to 1951. He then studied at the Carnegie Institute of Technology and graduated with the Bachelor of Science degree in 1954. He was hired in the family-owned 
Title: Olaf Holtedahl
Content:  Prof Olaf Holtedahl ForMemRS FRSE (24 June 1885 &ndash; 26 August 1975) was a Norwegian geologist (Dr.philos., 1913). He became a senior lecturer at the University of Oslo in 1914, and was Professor of Geology there from 1920 to 1956.
Title: Hans Heyerdahl
Content:   Heyerdahl was born in Smedjebacken, Sweden. He was the son of Halvor Heyerdahl and Hilda Margretha Haak (1834–1917). His father was a prominent engineer and architect. In 1859, the family moved to Drammen, where his father took up the joint posts of city engineer and fire chief. Heyerdahl was educated in Christiania (now Oslo), Munich (1874–1877) and Paris (1878–1880). He began his education with the intent of following in his father's footsteps, but soon discovered that he was more attracted to drawing and art. In 1873, he entered the Norwegian National Academy of Craft and Art Industry and studied under Peder Cappelen Thurmann, a landscape 
Title: Hans Severin Holten
Content:  He was the son of a pharmacist in Helsingør, Johannes Holten (1741&ndash;1816) and his wife Anna Margrethe, born Abildgaard (1747&ndash;1826). He was born in Helsingør on 11 July 1770, and was named Johan after his father, but preferred to be known as Hans. During his upbringing and in his youth, he lived in the house of the Pentecostal priest P.D. Bast who was married to his aunt. In 1788, he became a student of the Nykøbing School, where he studied zoology. Later, he became the curator of scientific collections made by Prince Christian Frederik, who was later to become Christian VIII of Denmark. In 1801 he took up the post of science tutor for Prince Christian's younger brother, Prince Ferdinand, and at this time he lived at the royal residence of Sorgenfri Palace. In 1804 he accompanied the young prince on a journey 
Title: Holtet (surname)
Content:  The Holtet family, originating from Volstrup parish in Jutland, Denmark. A book, "The Holtet Family - A Family Genealogy" was written in 1932. Today, it is present on the Internet with a short translation into English. Also see the Danish Wiki about more exact details. Descendants have emigrated to the United States and Mexico.

Question: Who is the father of Hans Holtedahl?
Answer: Olaf Holtedahl.