Park co-founded Fitbit along with Eric Friedman in 2007 after they were inspired by sensors and software in the Nintendo Wii gaming console. They raised $400 thousand from friends and family and by 2015 Fitbit accounted for 88% of activity tracker sales in the United States. Fitbit went public on the New York Stock Exchange in June 2015. Park dropped out of Harvard University and worked for a year at Morgan Stanley. He was a founding engineer at software company Epesi Technologies which he co-founded. In 2002 Friedman and Park started the digital photo sharing service Windup Labs and then sold it to CNET in 2015. Friedman stayed on and led a team of engineers before he left to start Fitbit.
