NEW YORK: Marco Greenberg, founder and CEO of independent agency NYPR, has decided to close his profitable and fast-growing shop to pursue his passion for international affairs.Greenberg founded NYPR four-and-a-half years ago, and has grown the shop to just under $2 million in billings. Last year, NYPR bucked the trend for tech-focused shops, successfully diversifying its client base and increasing revenues by 27%. But he said the enjoyment of running the business has waned, and that events in the past year - including the 9/11 death of close friend and client Danny Lewin, president of Akamai Technologies - have fueled his desire to put his international affairs experience to good use. Selling the firm, with the inevitable earn-out period, did not appeal to Greenberg. He looked into selling NYPR to the staff, but could not agree on terms. Some of the staff of 13 have already taken posts or freelance contracts with clients, and Greenberg said he was sure they'd all find work. "We have always hired non-traditionals with real intellectual curiosity. Our clients have always raved about the quality of the staff." Doug Picker, PR director at Symbol Technologies, a long-time NYPR client, agreed, "We are sad they're closing. They differentiated themselves by having brilliant people who were always there for us."