As far as local dealers go, Nina Johnson has earned her spurs on the local scene as a tireless dynamo and community activist. Her gallery has become a favorite hub for art lovers searching for provocative exhibitions that linger in the mind long after one leaves her lively, shape-shifting space. Since opening its doors in November 2007, Diet has become known for its modest yet focused stable of emerging and mid-career artists as well as an invitational program for international artists. Johnson has also organized lectures by visiting curators and critics, and publishes an electronic newsletter featuring reviews and interviews written by local artists on Miami's booming scene. Best of all, Johnson is among the rare handful of local dealers confident enough to give her artists free run of her space without waffling on the commercial necessity of hewing to the bottom line. Her shows are impeccably curated and often among the most discussed after the monthly Wynwood crawls. Among recent standouts were Maria Jose Arjona's beguiling performance marathon, "Remember to Remember," and Andrew Mowbray's witty "Tempest Prognosticator," in which the artist turned himself into a human weathervane. This past December, Brian Burkhardt transformed Diet into a veritable mad scientist's project, installing a sprawling bio-dome-cum-studio that housed samples of the hybrid species of plants and insects he has created during his career. For many people suffering from the bloated offerings that typically cramp the bowels during Wynwood's monthly openings, Johnson has proven a deft hand at trimming the fat from the bone.