TechStars is a mentorship-driven startup accelerator founded by David Cohen, Brad Feld, David Brown, and Jared Polis that holds 13 week programs for startups in Boulder, New York City, Boston, Seattle, and San Antonio. Fewer than 1% of the companies that apply to TechStars are accepted. Of the 114 companies that have completed the TechStars program, 92% are active and profitable. TechStars mentors include Foursquare CEO Dennis Crowley, tumblr CEO David Karp, HubSpot co-founder and CTO Dharmesh Shah, and Fred Wilson of Union Square Ventures. - Source: Wikipedia