Herman Gerard Jansen (Rotterdam, May 14, 1859 - Amersfoort, May 28, 1934) was a Dutch architect. Life and work He was the son of Gerard Jansen (1824-1897) and Janna Doeleman (1830-1877). During his youth, his hometown of Rotterdam was doing well economically. His father therefore hoped that he would go "into trade. However, Jansen preferred construction, especially the carpentry trade, so he attended first the Crafts School and then the Rotterdam Academy. Jansen was a diligent student. At the graduation ceremony, he received a silver medal. Amsterdam After his studies, he moved to Amsterdam, where he initially worked as a draughtsman and supervisor, including with Beirer for the building of the Society for the Working Class and with Van Gendt for the building of the Nieuws van den Dag. In Amsterdam, he was accepted into the circle of the architectural society Architectura et Amicitia, of which he was president from 1893 to 1895. In time he established himself as an independent architect and received a number of important commissions, such as from the Verkade firm in Zaandam, the Amsterdamsche Rijtuigmaatschappij and the Incassobank. American Hotel Jansen carried out several renovations of the old American Hotel before 1900. In 1900, the new owner August Volmer decided on new construction and expansion by adding the section on Singelgracht. Volmer's vision was that the new establishment should be a first-class hotel with a café and restaurants and rooms designed for larger groups. In addition to Willem Kromhout, Volmer added his house architect H.G. Jansen to the design team, because in addition to responsibility for relatively minor changes to the former building, Jansen also had an understanding of the organization and technical requirements of hotel and restaurant. Construction was completed in 1902. When, 25 years later, the board of the hotel, of which Jansen was now a member, decided to expand, he proposed in vain that it be done by Kromhout. Jansen was also a member of the Union of Dutch Architects and served on several special committees. Jansen died at the age of 75 and was buried June 1, 1934, at Rusthof cemetery near Oud-Leusden. He was married (April 23, 1896) to Maria Elisabeth van Hengel (Dec. 2, 1870 - † Sep. 4, 1945).