The sale of both companies amounted to
close to $2 billion, which allowed Musk to focus on
his lifelong passions in science, engineering, and
space. Musk is founder of and currently runs three
different companies: SpaceX (which made history
in May 2012 as the first private company to deliver
a cargo payload to the International Space Station
with its Dragon spacecraft), SolarCity (basically the
Walmart of solar panel installations for business and
residential customers),