Heikki Taavetti Aho (29 May 1895 – 27 April 1961) is viewed as a pioneer of Finnish documentary film.
Aho & Soldan was founded in 1925 in Helsinki, largely to enable a visual image of Finland as a newly born nation, and was active until 1961.
In the 1918 Finnish Civil War he served in the Red administration, but was captured by the Whites after the Battle of Vyborg.
Aho & Soldan produced more than 400 documentary films, is the largest such producer in the 1930s in Finland, as well as the movie JUHA (1937) directed by Nyrki Tapiovaara and based on the book by their father, the Finnish author Juhani Aho.
They were members of the ABISS-group (Aho, Brückner, Iffland, Setälä, Soldan) in the 1930s, focusing on Neues Sehen (New Vision) photography movement inspired by the Bauhaus.