Rick Turner has a long and varied career as an instrument maker, Starting his apprenticeship in 1963, he helped found Alembic Guitars in the early 70's, he worked for Gibson R&D for a while but eventually he started Rick Turner Guitars in Santa Cruz California. 

Now there appears to be three brands he runs, Rick Turner Guitars, Renaissance Guitars and Compass Rose Guitars and Ukuleles. Though Rick is more known for his work with Electrics and Pickups, the Compass Rose line is the Acoustic Line, (however you can have a pickup fitted), and the only one that currently has Ukuleles in it. 

The Compass Rose brand started out with only Tenor Ukuleles, but in 2014 they introduced Concerts, (I have seen a prototype Baritone too). The Ukuleles all have the same basic body shape but the woods used and the level of finish vary.