Paul English has left cofounder to focus on app development and helping startups

Paul English
Paul English

Paul English has officially left, the Concord travel website that he cofounded in 2004, the company confirmed Friday.

His exit comes a little more than a year after bought the rival airline and hotel booking site for $1.8 billion.

In August, the Globe’s Scott Kirsner reported that English was slowing down work at Kayak and turning his attention to a startup incubator in the Innovation District called Blade. So far, he has raised $20 million for the project. He is also teaching at MIT’s Sloan School of Management and has a new startup of his own called Pemberton Software Corp. It has already released two apps. In December, the Globe wrote about one of the apps, Road Wars, designed to prevent distracted driving.

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In a post on Thursday about a photo sharing app from Pemberton, the technology blog BostInno reported that English left Kayak in December.

English confirmed the departure in an e-mail. He said that he will devote part of his time to Pemberton but that Blade will be his full-time pursuit. It will launch in April.