The father of modern rocket propulsion is the American, Dr. Robert Hutchings Goddard. Along with Konstantin Eduordovich Tsiolkovsky of Russia and Hermann Oberth of Germany, Goddard envisioned the exploration of space. A physicist of great insight, Goddard also had an unique genius for invention.
By 1926, Goddard had constructed and tested successfully the first rocket using liquid fuel. Indeed, the flight of Goddard's rocket on March 16,1926, at Auburn, Massachusetts, was a feat as epochal in history as that of the Wright brothers at Kitty Hawk. Yet, it was one of Goddard's "firsts" in the now booming significance of rocket propulsion in the fields of military missilery and the scientific exploration of space.
This site from NASA contains a brief biography and photograph of the physicist and "father of modern rocket propulsion," Robert Hutchings Goddard. Among the many firsts by Goddard listed, is the first liquid fuel rocket (1926), which led to the development of military missiles and the possibility of space exploration. A link on the liquid fueled rocket leads to several photographs and engineering sketches and an account of its inaugural flight. Statistics (size, employees, locations, funding, milestones) about the NASA center which is named after Goddard are also available.