Devin programmed the applets and built this site as an undergraduate Computer Science student at UCSC.
Joel Primack is a Professor of Physics at UCSC. He originally designed the programs that make up Einstein's Rocket in the early 1980s with the help of Eric Eckert, who programmed them in 6502 assembly language.
The photographs of Earth, Jupiter, and Europa are all courtesy of NASA.
To everyone that has provided feedback.