[2] He was born into a prominent family that owns Zwack, a company that makes liqueurs and spirits and is known specifically for producing Unicum.

Zwack attended the Szent Imre Grammar School of the Cistercian Order.

[2] After several months in Ellis Island's refugee camp were granted US entry purely because they possessed the recipe for Unicom.

Zwack had the recipe split up and stored in four safety deposit boxes throughout New York City.

[2] While living in Chicago in 1956, Zwack, former president Herbert Hoover, Tibor Eckhard, and Sargent Shriver founded a charity named First Aid for Hungary which helped the refugees of the Hungarian Revolution of 1956.

[3] In 1971, he moved to Florence, Italy, to work with a relative producing small quantities of Unicum.

During the 1998 Hungarian parliamentary election, he was supported by SZDSZ, but he did not repeat his success four years ago.