Ludvig Holberg | Ludvig Nobel | Carl Ludvig Engel | Ludvig Holstein-Ledreborg | Sven Ludvig Lovén | Ludvig Verner Helms | Ludvig Lorenz | Ludvig Kornerup | Ludvig Holstein-Holsteinborg | Ludvig Faddeev | Johan Ludvig Runeberg | Johan Ludvig Heiberg | Hektoen enteric agar |
Fenger's lectures were very popular, and over the years, he trained several prominent physicians, including William James Mayo, Charles Horace Mayo, Nicholas Senn, James B. Herrick, Ludvig Hektoen, and Howard Taylor Ricketts.
During his appearance at the Norse-American Centennial in 1925, President Calvin Coolidge gave recognition to Leif Erikson as the Discoverer of America due to research by Norwegian-American scholars such as Knut Gjerset and Ludvig Hektoen.