Chris Parrish has left the CEO post at RogueSheep, the Seattle mobile application development shop best known for its work on the popular Postage app for the iPhone. A veteran of Adobe Systems and an engineering grad from the University of Washington, Parrish co-founded the startup in 2003.

RogueSheep’s Jeff Argast tells GeekWire that the departure was “quite amicable” and that Parrish simply wanted to pursue new opportunities. “His leaving has left quite the shoes to fill,” said Argast, who has assumed the CEO post. Meanwhile, Daniel Guenther has taken on the role of President focusing on product management, marketing and PR.

“As to what this means for RogueSheep, we’re continuing down the path as a product company and we have plans to continue building simple, useful, and fun applications as we go forward,” said Argast.

The company’s iPhone app, Postage, won an App Gem award at the 2009 Macworld event. The postage app allows users to create electronic postcards, and then share them with friends.

John Cook is co-founder of GeekWire. Follow on Twitter: @geekwirenews and Facebook.

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