Pyotr Ilyich Tchaikovsky

The most popular Russian composer of all time.

A portrait of Tchaikovsky.

Pyotr Ilyich Tchaikovsky wrote several works well known among the general classical public—Romeo and Juliet, the 1812 Overture, and his three ballets: The Nutcracker, Swan Lake, and The Sleeping Beauty. These, along with two of his four concertos, three of his six symphonies (seven if his program symphony Manfred is included), and two of his 10 operas, are probably among his most familiar works. Almost as popular are the Manfred Symphony, Francesca da Rimini, the Capriccio Italien, and the Serenade for Strings.

- Wikipedia

If you have time, you should read more about this incredible human being on his Wikipedia entry.