Dex Tooke was born and raised in Crane, Texas.  He has resided in Del Rio, Texas since 1978.  Dex began his athletic career in 1978 by competing in 5K and 10K running races.   He began combining cycling into his training in the late 1980's and competed in several duathlons and triathlons.  He also road raced in Mexico for several years where he was nicnamed Duro, meaning strong or hard.
Dex ran the Boston Marathon in 1996.  He started competing in ultra running events in the late 1990's. In 1997 he placed 6th place in a 24-hour ultra running race with a total of 101 miles.  In 2000, due to various running injuries, Dex decided to dedicate his entire training to cycling.  He entered the rare sport of ultra cycling.  His first ultra competition was at the Texas Time Trials where he completed 320 miles in a 24-hour ultra race.  Dex typically logs 18,000 to 20,000 miles per year on his bicycle.   In 2010 Dex and support crew competed in the Race Across America.  RAAM is a non-stop 3000 mile bike race that begins in Oceanside, California and ends in Annapolis, Maryland.  Team Dex made it all the way to Maryland, but failed to complete the entire distance in the 12 day, 19 hour time limit.  Dex returned to RAAM in 2011 to take care of Unfinished Business. He completed The 3000 mile race in 12 days 19 hours and by doing so became only the 6th person in history over the age of 60 to complete solo RAAM.  Dex owes much of his success to his wife and crew chief, Joni Tooke.  She plays a major roll in his chosen lifestyle.  Dex continues a rigorous training regimen and regularly commutes 25 miles daily to his workplace.