Although many Saalburg illustrations can be found on the Internet, biographical information is sparse. One site with a good deal of information regarding his work and working practices is here, though it has little about his personal life. For what it's worth, I can add that, although he was American, he was born in London and died in Paris -- fitting places given the scenes he usually portrayed.
An illustrator a decade older than Saalburg who had a similar career with regard to style and subject matter was Lawrence Fellows (1885-1964) who I wrote about here.
Below are some examples of Saalburg's work.