—Jupitermedia: Jupitermedia’s President and COO Christopher Cardell has resigned, and Chairman and CEO Alan Meckler will take on both of Cardell’s former roles. The Darien Conn.-based media company recently sold its online images division for $96 million (to rival Getty Images), in order to focus on its properties like Mediabistro.com and EarthWeb.com.

—National Geographic: John Caldwell has been named president of National Geographic Digital Media (NGDM). Caldwell will oversee all NGV digital media and business initiatives, including operation of Nationalgeographic.com and its digital extensions. He was serving as acting president of the NGDM group since last May. Caldwell joined NGDM in 2007 as vice president of strategic development, and prior to that was VP, corporate development, for the consumer health start-up Revolution Health Group.

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