Over 15 years ago, New Zealand engineer, Dr. Keith Alexander worked on creating a safe trampoline for his family. In 2002, an initial… | Instagram
![Keith Alexander's invention took 15 years and has made $55 million, but he doesn't own it | Stuff.co.nz Keith Alexander's invention took 15 years and has made $55 million, but he doesn't own it | Stuff.co.nz](https://resources.stuff.co.nz/content/dam/images/1/n/i/4/c/u/image.related.StuffLandscapeSixteenByNine.710x400.1ni4ch.png/1513715649304.jpg?format=pjpg&optimize=medium)
Keith Alexander's invention took 15 years and has made $55 million, but he doesn't own it | Stuff.co.nz
![RENKERT Alexander (USA) M - 2019 Trampoline Worlds, Tokyo (JPN) - Qualification Tumbling R1 - YouTube RENKERT Alexander (USA) M - 2019 Trampoline Worlds, Tokyo (JPN) - Qualification Tumbling R1 - YouTube](https://i.ytimg.com/vi/l0VRND5JKzo/maxresdefault.jpg)