McIntosh is currently head of editorial development at Guardian.co.uk, where he has worked in various roles, initially for the technology section, and then for the website.
"After nine-and-a-half wonderful years at the Guardian, I've decided to move to pastures new," he said in a post on his personal blog.
"WSJ.com has been making great strides of late, including an impressive redesign unveiled just as the current crisis took hold last month. The team there is working to create something outstanding around one of the biggest stories of the time, and it's a huge thrill to be asked to take the helm in Europe," he wrote.
"I'll be developing European editorial from London, although I'll also be working on some special projects with the global operation in New York. Things kick off in the New Year."
"It's been a privilege to work for the Guardian in print and on the web, working on some big stories and meeting fascinating people along the way. On guardian.co.uk, I've had enormous fun doing things like building our blogs, and launching our audio and video services," he wrote.
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