Sydney, Australia
Maurice Kelter
Runner. Builder. Investor. I train 100km a week, build products, and back the next generation of founders.
Training for a sub-2:30 marathon at Gold Coast in July 2026. Running is where I do my best thinking.
Learn moreBuilding5 projectsTools built for problems I actually have — running, investing, and getting things done.
Learn moreInvestingAngel investorEarly stage. StartMate First Believers cohort. Focused on SaaS and sports. Just getting started.
Learn moreLatest Writing
All posts →Grab Your Harness!
Everyone's been watching the models get smarter. Bigger context windows, stronger reasoning, better instruction-following. But that's only half the story. The more important question is what turns a model into something people actually use — and the answer is the harness.
Compounding: Creation, and Quiet Destruction
Compounding is one of the most powerful forces in the world. At its best it builds wealth, knowledge, and trust — slowly at first, then all at once. But compounding is indifferent. It doesn't care whether it's amplifying something true or false, good or bad. That's where it becomes dangerous.
Ultra66: One Kilometre for Every Year
I ran 66km to mark my mother's 66th birthday and raise money for a cancer support charity. Cars beeping, people clapping from doorsteps, strangers cheering from the side of the road. We raised over €18,500.