Jacek Andrzej Jaworski vel Jack Mac Lase
was born in Krakow, Poland. He is a doctor of physics . He worked in scientific institutes and universities in Poland, Germany, Japan and Korea. His hobby is scuba diving, travels, judo, photography. He traveled to countries in Europe, Asia, South America and Africa. He came back to Poland and he is plans to write books.
Author is a scuba diver
and has the black belt in judo.