Clayton Michael Greenfield Bio
Clayton Michael Greenfield is an American professional stock car racing driver and team owner born June 3, 1984, in Clarksville, Tennessee. He built his career around the NASCAR Craftsman Truck Series, where he has competed in a part-time capacity for multiple seasons across more than a decade. Greenfield has also fielded his own entries through GK Racing, demonstrating both driving ability and business acumen within the sport. His body of work includes starts in the Truck Series and the Nationwide Series, as well as earlier experience in the ARCA Racing Series and regional late-model competition.
Early Life and Background
Greenfield was born and raised in Clarksville, Tennessee, a community with deep ties to racing culture in the southeastern United States. He attended Clarksville Academy, where he graduated before committing fully to a career in motorsports. Growing up in Tennessee placed him within a short drive of several notable speedways, including Nashville Superspeedway and facilities throughout the Southeast that have long served as proving grounds for aspiring NASCAR drivers. His early exposure to competitive racing came through the UARA-Stars Series, a regional late-model circuit that has helped develop numerous drivers who later advanced to the national NASCAR ranks.
The UARA-Stars Series provided Greenfield with consistent seat time and racecraft experience before he stepped up to the ARCA Racing Series. His progression through regional competition reflected a deliberate approach to building a résumé that would support moves into NASCAR’s national touring series. The foundation he laid in those formative years gave him the practical knowledge and résumé needed to secure rides in NASCAR’s national competition beginning in 2010.
Path to NASCAR
Greenfield’s first appearance in the ARCA Racing Series came at Salem Speedway in 2004, driving for Wayne Peterson Racing. He finished twelfth in that debut, a result that stood as the team’s best race finish since 1998 — a strong early validation of his ability on larger, faster tracks. He also made additional ARCA qualifying attempts in the mid-2000s, accumulating experience that bridged his regional racing background with the type of preparation required for NASCAR national series competition. These ARCA outings served as a direct pipeline into the NASCAR Camping World Truck Series.
In 2010, Greenfield made his debut in NASCAR competition at Martinsville Speedway, driving for Team Gill Racing in the Camping World Truck Series. That same year marked the beginning of a relationship with the Truck Series that would span more than a decade. He followed that debut with an appearance in the Nationwide Series in 2011, finishing 35th at Atlanta Motor Speedway in the No. 71 for Rick Ware Racing. These early national series starts established Greenfield as a regular part-time competitor willing to take opportunities wherever they arose.
Clayton Michael Greenfield Career
Early Career (2004–2009)
Before entering NASCAR, Greenfield’s primary competitive outlet was the UARA-Stars Series, where he ran a consistent schedule that allowed him to develop as a driver on short tracks and larger ovals. In 2004, he made his ARCA Racing Series debut at Salem Speedway, finishing twelfth for Wayne Peterson Racing — the team’s best result in nearly six years. That performance signaled he could compete effectively in faster, superspeedway-style equipment. Additional ARCA qualifying attempts followed in the mid-2000s, rounding out his résumé before he made the leap to NASCAR national series competition in 2010.
NASCAR Craftsman Truck Series Breakthrough (2010–2013)
Greenfield made his NASCAR Camping World Truck Series debut in 2010 at Martinsville Speedway, driving for Team Gill Racing. Over the next three seasons, he competed in 22 Truck Series races, steadily gaining experience across a variety of track types. His best finish came at Daytona International Speedway in 2012, when he placed tenth — a career-best result in the series. In 2011, he also made his Nationwide Series debut, finishing 35th at Atlanta Motor Speedway in Rick Ware Racing’s No. 71, broadening his national series résumé.
The 2013 season brought both promise and frustration. Greenfield posted the fastest practice time for the Truck Series season-opening event at Daytona International Speedway in February, demonstrating genuine speed before the race. He finished 26th in the event itself, then failed to qualify for the following two races. A sixteenth-place finish at Kansas Speedway provided a brief bright spot before he returned at Kentucky Speedway in July, finishing 35th for Norm Benning Racing. The 2013 Mudsummer Classic at Eldora Speedway proved to be a defining competitive moment: Greenfield and Norm Benning were contending for the final transfer spot into the race, only to lose that position to Benning’s own part-time entry — a disappointment that ended his association with Benning’s team.
GK Racing Era (2020–Present)
After a period away from full Truck Series competition, Greenfield returned in 2020 to run a part-time schedule in the NASCAR Craftsman Truck Series. That season saw him field entries through GK Racing in the majority of races, with the notable exceptions of Las Vegas Motor Speedway, the Daytona road course event, and the championship finale at Phoenix Raceway. His return was marked by an unusual and noteworthy crew chief pairing: Greenfield secured the services of Fox NASCAR commentator and two-time Cup Series champion crew chief Jeff Hammond, who came out of retirement specifically to crew chief Greenfield’s No. 68 Truck in the races it was entered. The move brought considerable attention to Greenfield’s program and elevated the profile of GK Racing’s operation.
In 2021, Greenfield intended to run a fuller Truck Series schedule but was limited by sponsorship constraints. He ultimately qualified for and started only three races. A nineteenth-place finish at Darlington Raceway was an impressive result given the reduced schedule and preparation resources. He also joined Spencer Davis Motorsports for the UNOH 200 at Bristol Motor Speedway, adding another team to his résumé for the season. These years demonstrated Greenfield’s persistence in maintaining a competitive presence in the Truck Series despite the financial and logistical challenges inherent in running a part-time, owner-operated program.
Driving Style and Strengths
Greenfield’s résumé reflects a driver primarily suited to superspeedway and intermediate oval competition. His tenth-place finish at Daytona International Speedway in 2012 and his practice speed at the same track in 2013 both pointed to an ability to handle drafting and pack racing at the sport’s fastest venues. His career-best finishes have come at Daytona and Darlington, both tracks that reward a combination of patience, aggressiveness at the right moment, and sound racecraft over 200-plus laps. Working with a crew chief of Jeff Hammond’s caliber in 2020 provided Greenfield with championship-caliber strategic guidance during that phase of his career.
Notable Races and Milestones
Greenfield’s best-known result remains his tenth-place finish at Daytona International Speedway in the 2012 Truck Series season, one of the few top-ten finishes of his NASCAR national series career. His pole-speed practice run for the 2013 Truck Series season opener at Daytona — before finishing 26th in the race — illustrated the raw speed he could bring to a superspeedway event. A nineteenth-place finish at Darlington Raceway in the 2021 season stood out as a quality result earned under difficult circumstances, as it came in a part-time program with limited preparation. His 2004 ARCA debut at Salem Speedway, yielding twelfth place and Wayne Peterson Racing’s best finish since 1998, also remains a notable early-career milestone.
Clayton Michael Greenfield Career Wins
Greenfield’s NASCAR national series résumé includes a verified top-ten finish in the Truck Series, achieved at Daytona International Speedway in 2012, as well as strong qualifying performances and consistent entries across multiple seasons of part-time competition. His results span the Truck Series and the Nationwide Series, with the bulk of his competitive appearances coming in Truck Series machinery fielded by his own GK Racing operation and various partner teams.
NASCAR Craftsman Truck Series Highlights
In the Truck Series, Greenfield’s career-best finish of tenth at Daytona International Speedway in 2012 represents his most significant individual result in NASCAR national series competition. He competed in 22 Truck Series races between 2010 and 2013, posting additional top-20 finishes at Kansas Speedway (sixteenth) and Darlington Raceway (nineteenth in 2021). His 2020 return to the series was highlighted by securing Jeff Hammond as crew chief, a noteworthy achievement for an independent, part-time team. Greenfield’s Truck Series career reflects a driver who consistently competed at the highest level available to part-time, owner-driver entries.
Other Wins and Performances
Before his NASCAR career, Greenfield’s twelfth-place finish at Salem Speedway in his 2004 ARCA Racing Series debut stood as Wayne Peterson Racing’s best race finish since 1998, underscoring the impact of his performance in that series. His ARCA résumé includes additional qualifying attempts in the mid-2000s, giving him meaningful superspeedway and short-track experience on the ARCA circuit. In the Nationwide Series, Greenfield made one start in 2011 at Atlanta Motor Speedway, finishing 35th in Rick Ware Racing’s No. 71 — a debut appearance that added national series experience to his growing motorsports résumé.
Clayton Michael Greenfield Family
Family Background and Racing Lineage
Greenfield was born in Clarksville, Tennessee, and attended Clarksville Academy prior to beginning his professional racing career. Available public information does not document a direct family racing lineage or motorsports connections through immediate family members. His path into racing appears to have been forged through regional competition in the Clarksville area and the broader UARA-Stars Series circuit rather than through family-established ties to the sport. Details about his parents or extended family are not publicly available in verified sources.
Personal Life
Publicly available verified information regarding Greenfield’s personal life is limited. Details about his marital status, spouse, children, or other personal-life matters are not documented in the available sources. His public profile has remained primarily focused on his professional activities as a driver and team owner in the NASCAR Craftsman Truck Series through GK Racing.
2025 Season Performance
Clayton Michael Greenfield last competed part-time in the NASCAR Craftsman Truck Series, driving the No. 95 Chevrolet Silverado RST for GK Racing. Specific results and a detailed race-by-race account of the 2025 season are not available in the verified sources at this time. GK Racing’s part-time entry in the Truck Series reflects the ongoing operational model that Greenfield has maintained across multiple seasons, combining driver duties with team ownership responsibilities. The Craftsman Truck Series remains the primary competitive focus of his motorsports program heading into 2025.