In his Twitter bio, William Marshall calls himself a "quantum physicist cum space scientist in search of world peace and harmony." And when you hear about his job, it falls into place: He and his cofounders at Planet Labs want to show the earth what it looks like, in almost real time, via a new network of compact, capable satellites. They hope that up-to-date images will inform future humanitarian and commercial projects all over our planet and will help to enable people to make the best decisions for earth.
Before cofounding Planet Labs, Marshall was a scientist at NASA/USRA, where he helped to formulate the Small Spacecraft Office at NASA Ames Research Center. He worked on lunar orbiter mission LADEE, lunar impactor mission LCROSS and the groundbreaking PhoneSat project, building satellites out of consumer parts.