The Serbian scientist referred to in the crossword solution is Nikola Tesla, a renowned inventor and electrical engineer. He was born in modern-day Croatia in 1856 and is best known for his contributions to the design of the modern alternating current electricity supply system. Tesla's work revolutionized the way electricity is generated, transmitted, and used. He also made important discoveries in the field of electromagnetism and wireless communication. Tesla's inventions and theories have had a lasting impact on the world of science and technology.