Knurek was born in 1966 Wyandotte, Michigan.
In 2007, Knurek became an organ donor when he donated a kidney to a family member. Knurek and his cousin underwent the transplantation surgery at the University of Michigan Health System’s Transplant Center on July 11, 2007. His cousin suffered from Polycystic kidney disease.
He currently lives in Fishers, Indiana, with wife his Kathy and his children Sydney and Cameron.
Knurek graduated from the University of Michigan and graduated with a degree in industrial design. In 1989, while working for the I.D.E.A. toy invention studio, his creation Spikeball was marketed by Tomy.
Knurek is also the inventor of "What's in Ned's Head?" a popular game that has received several parenting awards. Since its creation in 2003, many schools are using this game as a secondary bonus to their classrooms and as an adjunct to speech therapy.
Knurek took over as cartoonist for the Jumble in 2008, becoming the third cartoonist the syndicated feature's history. In 2014, he and Hoyt produced the Just Jumble app. He has been a member of the National Cartoonists Society since 2013.
- National Kindey Foundation: Jumble Artist Encourages Organ Donors , Retrieved 9 October 2016
- "Boggle BrainBusters by David L. Hoyt and Jeff Knurek". Tribune Content Agency. Retrieved 9 October 2018.
- Tribune Content Agency Biography - David L. Hoyt , Retrieved 9 October 2018
- Towne Post: More Than Just the World’s Biggest Syndicated Puzzle Guy , Retrieved 9 October 2016