David Castillo's work ethic would have put the Puritans to shame. The young dealer often clocks 14-hour days, out-hustling competitors and regularly organizing gallery and museum shows for his modest stable of emerging and midcareer artists. The Yale grad has been in the business 13 years, successfully trafficking in the secondary modern art market with the museum trade. But it's in his pristine Wynwood gallery where Castillo is leaving heavy footprints on the local scene. From Pepe Mar's impish cut-up three-dimensional collages, riffing on pop culture artifice, to Andrew Guenther's psychedelic lobster-clawed space aliens, to Leyden Rodriguez-Casanova's brainy excavations of contemporary domestic life, Castillo's shows have been consummately curated and first-rate. It comes as no surprise that one of Miami's sharpest talents, Glexis Novoa, has recently entered Castillo's budding stable, considering the gallery has been swamped by more than 3,000 artist submissions since opening in 2005.