17 Agency Is a New York City-based, full-service Internet marketing & web development company. in 2010 by David Bolis, 17 Agency has grown into one of New York's premier Internet marketing firms, helping businesses in the realms of SEO, content creation, social media, paid search management, web design and development, and more. 17 Agency's marketing approach has succeeded in industries ranging from accounting to technology, for B2B, B2C, and B2G companies.