Soft-spoken by nature, south Florida-bred Roosevelt Collier does his hollering on the sacred steel guitar. Brought up in the tradition of the House of God Church, Roosevelt built his reputation alongside his uncles and cousins in The Lee Boys, known for their spirited, soul-shaking live performances. Seated front and center, “The Dr.” leaves an indelible mark on listeners, flooring audiences with his lightning-fast slide work on the pedal steel. At festivals, he is a regular “Artist at Large,” performing alongside many of music’s most prestigious acts, from the Allman Brothers, to the Funky Meters, to Los Lobos to the Del McCoury Band. Whether on tour with the Lee Boys, bouncing from stage to stage at festivals, or hosting an allstar get down in Miami, when Roosevelt takes the stage, the ear-to-ear grins can’t help but be contagious.