airshipurban121Urban Airship’s four co-founders are reuniting — but not to start another company.

Rather, Michael Richardson and Steven Osborn are coming back to work for the company they helped start in 2009.

As fellow co-founders Scott Kveton and Adam Lowry stayed in Portland and helped Urban Airship grow, Richardson traveled across the Atlantic to set up a satellite office in London while Osborn left in 2013 to start a Portland-based remote-monitoring company called Smart Mocha.

But now they’re back at Airship, with Osborn serving as Principal Research Engineer and Richardson heading up the company’s new R&D team.

“Smart Mocha is alive and well, shipping hardware betas to customers and hiring talented folks to help accelerate their public launch and transform the world of remote monitoring,” Osborn wrote in a blog post today. “I remain involved as a shareholder and advisor, but the guys at Urban Airship made it pretty impossible for me to do anything else, other than to eagerly hop back on board the Airship for what will surely be another wild ride.”

Urban Airship, a mobile analytics and push messaging powerhouse, employs about 160 people and raised a huge $25 million funding round in February 2013. Both Urban Airship and Smart Mocha are graduates of the Portland Incubator Experiment.

Related: Urban Airship CEO Scott Kveton on striking out with VCs and why pitch decks suck

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