About Us
Greg Gilleland is the founder and President of GPK Aviation.
We have a passion for aviation and pride ourselves in providing exceptional and unparalleled aircraft brokerage and acquisition services. Our in-depth knowledge and understanding of the Beechcraft King Air and Cessna Citation markets is second to none.
GPK Aviation is well known and respected within the aviation industry. We value these business relationships and welcome the calls from other aircraft sales professionals and friends to get our expert opinion on aircraft values.
Whether buying or selling an aircraft, our team is here to partner with you and serve you with Honesty and Integrity.
Sales Leadership
Greg Gilleland
Greg started his aviation career as an Aircraft Researcher at one of the premier used aircraft dealers, Gantt Aviation, in 1987 after graduating from Southern Methodist University. In 1991 Greg was hired by Beechcraft-Houston to sell new aircraft; King Airs, Bonanzas, Barons and Beechjets. In 1994 Greg and his family moved back to Georgetown, Texas to sell aircraft for long-time aviation professional Bob Currey. In January 2003, Greg started his own company acquiring aircraft for inventory, brokering and acquisitions. Most aircraft sales are Citations, Hawkers and King Airs.
Greg lives in Granite Shoals, Texas, with his wife, Robin. They have 3 adult children, Garrett, Payton and Kylie. Garrett and Payton are married and live in Austin. Kylie resides in Georgetown, Texas. Greg enjoys the outdoors and spending as much time as possible at Lake LBJ.
Steve Muller
Steve grew up in South Africa and was introduced to aviation at a very young age. His first flight on a Cessna 172 was completed out of Virginia Airport in Durban, South Africa with his dad when he was 8 months old. After graduating High School, Steve served two years in the South African Defense Force. He then joined Standard Bank of South Africa for 5 years and completed General Banking and Project Management duties. Upon leaving Standard Bank, Steve realized his life-time passion for aviation and joined Balmoral Central Contracts. Balmoral was an aviation company in South Africa specializing in Contracts, Charter and Aircraft Sales. During his eight years with Balmoral he was promoted to Operations Manager for the Fixed Wing Operations and obtained his Private Pilots license.
In May of 2004, Steve relocated from South Africa to Atlanta, Georgia, to join Allied Jet International, an Atlanta based aircraft broker. During his 15 years with Allied Jet International, he focused intently on the Beechcraft King Air markets and was promoted to Vice President of Aircraft Sales in 2010. In February of 2020, Steve joined GPK Aviation where he continues to specialize in the Beechcraft King Air market and is helping to further develop GPK Aviation.
Steve enjoys serving his church family, fishing and running. Steve is married to Anna and has two amazing children, Gabriella and Jackson.
Payton Sparks
Payton Sparks recently embarked on her journey in the Aviation industry, joining GPK Aviation in July 2024. Payton has been around planes and has been learning from her father, the founder of GPK, her whole life. She recently decided to make the career change into the Aviation Industry.
Payton attended the University of Texas and earned a degree in Psychology. After graduating from UT, she went on to pursue and earn her Master’s degree at New York University. Payton returned to Texas and pursued a career in private practice before deciding to enter the Aviation Business.
Payton lives in Austin, Texas with her husband, Keith, and daughter, Marian. They are expecting their second daughter in the Fall of 2024. When Payton is not working, she enjoys spending time at the lake, reading, and baking.