Jagersberger was born in Wiener Neustadt, southwest of Vienna, in Cisleithania, the Austrian component of the Austro-Hungarian Empire.
While in Paris, Jagersberger met American racer Harry Harkness, and decided to emigrate United States in 1902, eventually settling in Racine, Wisconsin.
He started working at Case Corporation in Racine to develop a car racing program.
[2] Jagersberger continued to race and in November 1911, in Columbia, South Carolina, he struck a fence due to a burst tire.
[3][4] Jagersberger continued to design cylinder heads and peripheral equipment and he started his own company, Rajo Motor and Manufacturing, several years later.