Gregory Paul Pronko was born in Harrisburg, Pennsylvania. His mother Genna (Borkowski), from Dupont, PA, is of Polish descent and worked for the Pennsylvania Dept of Revenue as did his father Myron Pronko, from Dickson City, PA who is of Ukrainian descent. Greg graduated from Bishop McDevitt High School (Harrisburg) where he was named to the 1980 PA Big 33 State Football Team. A former American football player, he attended Temple University, Philadelphia, PA and played wide receiver for the Owls under coaching legends Wayne Hardin and Bruce Arians (Arizona Cardinals). Greg earned a BBA degree and took acting courses at Temple and Drexel Universities. After a few NFL free agent tryouts it was time to pursue his business and acting career.

Greg began his professional acting career alongside a business career in the Philadelphia, NY and DC areas. He started in background roles in television/movies from Invincible, Rocky Balboa, The Wire, a fighter in The Last Airbender to a basketball player guarding Woody Harrelson in Friends with Benefits (2011) quipping "C'mon Man!". His theatre experience from 2005 to present has been local to Philadelphia where he has worked with a number of exceptional directors. He is a physical actor who has also had stage combat, dance and singing roles on stage as in A Funny Thing Happened On The Way To The Forum (Miles Gloriosus). He has also performed as a supernumerary in operas Tosca and Torandot at The Academy of Music, Philadelphia and War & Peace at the Kennedy Center, Washington, DC.

Greg has had supporting roles in various indie films and principle credits in films such as How Do You Know (2010), Paranoia (2013) and a Guest Star role in Boardwalk Empire (2012), appearing in the iconic Margate Sands beach scene with Gyp Rosetti (Bobby Cannavale). Recent roles include Poncho in Backfire (2017), writer/actor for Gossiping Grams (2018) and starring as Abram in "The I Am ..Project" (2018) Podcast series.