Hasta La Creative!

As a senior editor at Newsweek, Mark Coatney helped build the magazine’s Tumblr page, earning a following with his chatty and often irreverent posts. Early on, for instance, he breezily asked readers not to expose his Tumblr activity to his boss, then-Newsweek editor Jon Meacham.

When he left Newsweek to join Tumblr itself as its media evangelist in 2010, becoming just its 12th employee, Mr. Coatney took on introducing all kinds of companies to the fledgling platform and teaching them how to use it to better connect with their readers. By the time he decided to leave, Mr. Coatney had helped launch 650 Tumblrs for brands — including nearly all of Conde Nast’s Tumblrs — as well as nonprofits, government organizations and individuals (like Beyonce).

This week, Mr. Coatney told readers of his personal Tumblr page that he was leaving, making him the second early employee to depart since Yahoo struck its $1.1 billion deal for the company (Tumblr Creative Director Jacob Bijani announced his resignation less than two weeks after the Yahoo deal in May.)

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