Roesler Franz was born in Rome. He was a specialıst in the technique of watercolor. His most famous work is a series of 120 aquarelles (water colors) named "Roma sparita" (disappeared Rome), which depict with great realism parts of the city he supposed were going to be destroyed in the effort to modernize it. Many of his watercolors are in the Museum of Rome in Trastevere.
In 1902 he was portrayed by Giacomo Balla in a famous painting exhibited at the Venice Biennale. He died in Rome in 1907.