Petras Lukosius was born in 1956 in Lithuania.  At the age of fourteen, he began attending the Klaipeda Children's Art School (1970-71), followed by Telšiai Applied Arts Technical School (1971-1975).  In 1979, Lukosius graduated from the Klaipeda Branch of the Vilnius Academy of Arts in Lithuania.

He began participating in national shows when he was a teenager (1971), and international shows since 1982.  As a member of the Lithuanian Artist Union, he has held personal shows in his home country of Lithuania and around the world, including Germany, England, Spain, Sweden, Russia, Norway, USA, and Latvia.