Artwork: Marcus Marritt for NPR
Dr. Keith Alexander wanted a trampoline for his kids. His wife said they were too dangerous. So he decided to build his own.
Over 15 years of research and development he re-engineered the trampoline from the ground up to invent the Springfree Trampoline. Next he teamed up with Steve Holmes, a Canadian businessman, who took a big risk to commercialize it.
Today, Springfree Trampolines can be found in over 15 countries and has sold over 400,000 trampolines.
Listen to an interview with Dr. Keith Alexander and Steve Holmes on the podcast How I Built This with Guy Raz.