Jeff's first race was in 1973 at the legendary BUMS Bicycle Park in Long Beach, CA. That's where he first met Scot Breithaupt, who Jeff later rode for on the Dan Gurney, the FMF, and SE Racing Teams.
Jeff's best years were 1976-1977, when he finished number three in the nation for all combined classes (this was in the days before they gave out number ones for each age group, but if they had, then he would have been numero uno). 1976 was also the year that he garnered a number one in sidehack with Scot Breithaupt.
In 1977, Jeff finished national number 6 inspiring SE to create the legendary JU-6 frame (father of the PK Ripper).
Around that time, Jeff also won the first pro race ever held at WSA, a 14-and-older class in which the 14-year-old Jeff beat out the older and more experienced Kevin McNeil and Stu Thomsen.
From 1976 through 1979, Jeff became involved with CPSC, teaching bicycle safety to kids.
In 1981, Jeff became semi-retired to work for the family business, GJS, a BMX manufacturing company started by his father, George. GJS stands for the first names of George, Jeff and Jeff's brother Scott. The company set new standards in bicycle manufacturing by, among other things, being the first to use tubes for gussets instead of sheet metal. Some of the top riders in the sport rode GJS bikes, including Stu Thomsen, Bob Haro, and Clint Miller.
Jeff briefly got back into racing in 1983, then decided to focus on teaching beginning seminars and giving private lessons at Harbor BMX in San Pedro, CA. At that time, he also started manufacturing mini frames and forks under the JU Racing banner.
In the early 90s, Jeff was hired by the late Rich Long of GT Bicycles to set-up an in-house titanium manufacturing department.