He studied two years at the private Moscow School of Painting, Sculpture and Architecture but left in 1914 to serve in the Imperial Russian Army during World War I. He started work in children"s book illustration in Ukraine until he was conscripted by the White Army in 1919, soon to be a prisoner of war in Poland.
He is well known both for children"s book illustration and for erotic art Rojankovsky was born in Mitava, Courland Governorate of the Russian Empire (now in Latvia). Soon afterward, he moved to France and studied under Esther Averill.
In 1941, he moved to the United States and began a career of illustrating more than a hundred books, most featuring animals or nature.
Rojankovsky also wrote books, an example being The Great Big Animal Book, published in 1952. "Two great events determined the course of my childhood.
I was taken to the zoo and saw the most marvelous creatures on earth: bears, tigers, monkeys and reindeer, and, while my admiration was running high, I was given a set of color crayons. Naturally, I began immediately to depict the animals which captured my imagination.
