Watson was a fellow landscape painter from Waterloo County Ontario and a close friend of Carl Ahrens.
Lapine was a close friend and advocate of Ahrens' work during a period when most of the Toronto art community had turned against him.
O'Brien, active in the Toronto art community in the 1890s, was an early advocate of Ahrens' work. He encouraged Ahrens to go to New York to study under William Merritt Chase.
Macdonald was a student of Ahrens in the 1920s in Galt, Ontario. He later became the official artist for the Royal Canadian Navy during WWII.
Forster was an early mentor and teacher for Ahrens in Toronto in the early 1890s.
Bell-Smith was an early ally for Ahrens in Toronto in the early 1890s. Ahrens sometimes painted the native symbols in Bell-Smith's work.
Reid was an early friend and teacher for Ahrens in Toronto in the early 1890s.
Grier, a portrait painter active in the Toronto art community, helped arrange for Ahrens to study in New York in the 1890s.
Inness, a famous American tonalist painter, became one of Ahrens' most influential mentors. He encouraged Ahrens to leave New York, return to Canada, and paint what he wanted. Ahrens resigned from all Toronto art societies to fee himself from outside influences.
Chase, a famous American painter, taught many students, including Ahrens, at the Art Students' League in New York City.
Fournier was a resident painter at Roycroft, an arts and crafts community in East Aurora, New York, in the early 1900s. Ahrens and Fournier became friends there.
Carl Ahrens by Andre Lapine. Likely drawn around 1915.
Pencil sketch of Carl Ahrens by E. Wyly Grier. Likely drawn in the early 1890s.