Jonathan S. Kellman
Music, motivation, and practical tools — from a guy who never stopped teaching
Who Is Jonathan Kellman?
Jonathan Kellman is a musician, educator, and tool-builder with three decades of teaching experience. Also known by his full name, Jonathan S. Kellman, he started on trumpet at age 10 and has since picked up more than 20 instruments, saxophone chief among them. He brings that same lifelong teaching instinct to everything he shares here, whether it’s music, motivation, or the everyday tools that make life a little easier.
Jonathan Kellman now spends his time building practical calculators and tools, sharing music resources, and offering encouragement to lifelong learners.
What Does Jonathan Kellman Do Today?
Today, Jonathan Kellman (Jonathan S. Kellman) works as a tool-builder and educator. He builds practical calculators like the BMI Calculator, Age Calculator, and Loan & Interest Calculator, along with music tools such as the Metronome and Capo Position Finder. He also shares motivation drawn from decades of teaching and leading. Here’s what he’s put together so far:
Music Tools
Calculators and references built by Jonathan Kellman, a saxophone and trumpet player, for fellow musicians.
General Tools
Everyday calculators and converters, put together by Jonathan for everyday tasks.
Motivation
Encouragement and lessons from a lifetime of teaching and leading. Jonathan believes anyone can learn something new at any stage of life, a lesson three decades of teaching and leading have only reinforced. (Coming soon)