Who Is Byeong Hun An's Caddie?
Justin York has been caddying for the South Korean in recent years - here's what we know about him


Byeong Hun An has been building a solid career on the PGA Tour in recent years, and reached a career-high world ranking of 23rd in May 2024.
During the latter part of that rise, the South Korean pro has had Justin York caddie for him. York was born in Phoenix, Arizona and played junior college football at Arizona State University before beginning work as a full-time caddie for Roger Tambellini in 2008, who he helped to victory on the Nationwide Tour (now Korn Ferry Tour) a year later.
Since then, he has caddied for pros including Chez Reavie, K.J. Choi, Josh Teater, Colt Knost, Y.E. Yang and Adam Schenk, before beginning working with An in 2022.
Before teaming up with Byeong Hun An, Justin York caddied for Adam Schenk
It’s a partnership that is proving productive, with highlights including top-10 finishes in the 2023 Valero Texas Open and Genesis Scottish Open, a T2 at that year’s Wyndham Championship and further successes in 2024, including fourth at signature event The Sentry, runner-up at the Sony Open in Hawaii and third at the Wells Fargo Championship.
With York’s guidance, An eventually reached 12th on the FedEx Cup standings to comfortably qualify for the first of the Playoffs, the FedEx St. Jude Championship, as his career scaled new heights.
York grew up admiring Justin Leonard, while his favorite course to caddie is the venue for the 2025 PGA Championship, Quail Hollow in North Carolina.
In an interview with the Caddie Network, York explained that his nickname on the circuit is Birddog, which was given to him by Andy Sanders and Mike Christensen. York explained to the pair during an event how adept he was at finding balls, saying he was good at “birddogging” them. They called him Birddog once, and it stuck.
Get the Golf Monthly Newsletter
Subscribe to the Golf Monthly newsletter to stay up to date with all the latest tour news, equipment news, reviews, head-to-heads and buyer’s guides from our team of experienced experts.
While York’s caddying abilities – and ball-finding skills – are well known, it’s not just on the course where he excels.
Outside the game, he’s a strength coach, while his favorite sports team is the Dallas Cowboys. He enjoys movies, too, with the one he admires the most being One Flew Over the Cuckoo’s Nest. He also enjoys baseball and video games.

Mike has over 25 years of experience in journalism, including writing on a range of sports throughout that time, such as golf, football and cricket. Now a freelance staff writer for Golf Monthly, he is dedicated to covering the game's most newsworthy stories.
He has written hundreds of articles on the game, from features offering insights into how members of the public can play some of the world's most revered courses, to breaking news stories affecting everything from the PGA Tour and LIV Golf to developmental Tours and the amateur game.
Mike grew up in East Yorkshire and began his career in journalism in 1997. He then moved to London in 2003 as his career flourished, and nowadays resides in New Brunswick, Canada, where he and his wife raise their young family less than a mile from his local course.
Kevin Cook’s acclaimed 2007 biography, Tommy’s Honour, about golf’s founding father and son, remains one of his all-time favourite sports books.
-
Hye-Jin Choi Facts: 10 Things To Know About The LPGA Tour Pro
Hye-Jin Choi had a glittering amateur career, and she’s taken that into her professional journey, with a host of wins – here are 10 things to know about her
By Mike Hall
-
Yan Liu Facts: 10 Things To Know About The LPGA Tour Pro
Yan Liu has been making solid progress in her professional career – here are 10 things to know about the LPGA Tour golfer
By Mike Hall
-
Who Is Kevin Velo's Caddie?
Bart Barnes has caddied for Kevin Velo as he has built his professional career - here's what we know about him
By Mike Hall
-
Who Is Isaiah Salinda's Caddie?
Isaiah Salinda is one of the game's rising stars, but who has he had on the bag for him?
By Mike Hall
-
Who Is Jacob Bridgeman's Caddie?
The PGA Tour pro is one of the rising stars of the game, and assisting him in the early years of his pro career has been caddie GW Cable
By Mike Hall
-
Who Is Luke Clanton's Caddie? Meet Jason Wiertel
Luke Clanton was one of the first graduates from the PGA Tour U Accelerated program and has been with his caddie since long before turning professional
By Jonny Leighfield
-
Who Is JJ Spaun's Caddie? Meet Mark Carens
Find out more about Massachusetts-born Mark Carens, who has enjoyed a highly-successful career to date and has been on the bag of JJ Spaun since April 2021
By Jonny Leighfield
-
Who Is Jake Knapp's Caddie?
Less than 18 months after earning his PGA Tour card, Jake Knapp had a win and a 59 on his resume, and alongside him as he's built his reputation is caddie Mike Stephens
By Mike Hall
-
Who Is Kevin Yu’s Caddie?
Californian Zeke Salas has assisted Kevin Yu during the opening years of a promising PGA Tour career – here’s what we know about him
By Mike Hall
-
Who Is Max Greyserman's Caddie?
After a spell with James Moreno, Max Greyserman's has turned to Adam Parmer as his PGA Tour career progresses
By Mike Hall