Slavoljub Eduard Penkala

He attended the University of Vienna and Royal Saxon Polytechnic Institute, graduating from the latter on March 25, 1898, and going on to earn a doctorate in organic chemistry.

During his studies, he attended violin lessons where he met his future wife, pianist Emily Stoffregen.

Collaborating with an entrepreneur by the name of Edmund Moster, he started the Penkala-Moster Company and built a pen-and-pencil factory that was one of the biggest in the world at the time.

Among his patented inventions were: He also founded another company called the Elevator Chemical Manufacturing Company, which produced various chemicals such as detergents, sealing wax, and "Radium Vinovica", a patent-medicine – like product that was billed as curing rheumatism.

Penkala died in Zagreb at the age of 50, after catching pneumonia on a business trip.