A Message From Calum

Link to Pledge Per Person Passed

Link to Donate Today!

Calum started running at the age of four years old at the 1988 Cajun Cup 1km. 

Originally born in Aberdeen, Scotland to Canadian parents, Calum grew up all over the world moving to England, Thailand, Australia, and back-and-forth between the USA and Canada to his current location of Houston, Texas. 


His wife, Julie, and three girls Alessandra (7), Holland (4), and Maya (2) have helped define Calum’s running career after a series of Guinness World Records pushing Aley and Holly in the stroller. He is a diverse runner competing in all distances on all terrains in a single year, from speed on the track to grueling ultra’s in the mountains and everything in-between. Neff has also been coaching for over 15 years and operates his own training programs online and locally through Hardloop Endurance.


Neff first watched his Dad run the Houston Marathon in 1989 before competing himself with a debut at the marathon in 2014 (2:35) and again in 2015 (2:22), 2016 (2:23), 2017 paced women's elite athletes, 2018 as media advisory, and 2019 running the Aramco Half in a personal best of 1:07:22.


In 2020 Neff will be the Last Man Starting, an estimated 40 minutes after the gun fires and all participants have crossed the start line, at which point the challenge to pass as many people as possible in the half marathon begins. Each runner caught will earn a pledge for the non-profit Houston Marathon Foundation which awards scholarships and other funding to worthy local recipients. You can donate or pledge yourself and watch out for Neff on race day!

Member of Canadian National Teams:

2013 Mountain Running Poland
2015 Mountain Running Wales
2017 50k Trail Italy
2017 50k Road China (2nd Place)
2019 50k Road Romania (2:57 PR and 16th)

Guinness World Records:

Marathon Pushing Stroller, 2:31:21
Half Marathon Pushing Stroller, 1:11:27
24h Treadmill Relay, 394.76km

2018 Down Run, 6:08:06
2019 Up Run, 6:18:25

Recent Performances:



Toronto Waterfront Marathon, 2:20:44

IAU 50km World Championships (Romania), 2:57, 16th

5,000m Track, 14:39 

Houston Aramco Half Marathon: 1:07:22

Houston HARRA Spring Runner of the Season

Brazos Bend 50k Trail: 2:59:00 Course Record

RRCA Texas State 5k Champion


The Woodlands Marathon Champion
Runner’s World Festival Grand Slam Champion
RRCA Texas State 25k Champion
RRCA Regional Half Marathon Champion
RRCA National 10k Champion
Crescent City Classic 10k: 31:36
Houston Marathon (2015), 2:22:59


Facebook: https://www.facebook.com/NeffRunning
Instagram: https://www.instagram.com/calneff
Twitter: https://www.twitter.com/calneff
Athlete Website: https://www.neff.run  

Coach Website: https://www.hardloop.run
Strava: https://www.strava.com/pros/1014024