My professional life begins with my PhD in Astrophysics from Princeton University in 1982. My first job was at Caltech's Jet Propulsion Laboratory, where I was responsible for relativistic clock corrections for GPS. I encountered Stephen Wolfram, who gave me a copy of SMP for verifying my calculations. SMP later became the product named Mathematica. I have used Mathematica daily throughout my working life: 10 years at JPL, 20 years at Microsoft, 8 years at Amazon, and 3 years at GSIT. I use it to design code in other programming languages, so that when I write code in those languages, I have very high confidence that it's correct and my debugging workload is reduced.
In addition to the blog above, please visit my older blog here http://lorentzframe.blogspot.com/.