Luthiers

Tobias Braun - Gaaden, Austria. Fine guitars and guitar making courses.

Gerhard J. Oldiges - Marburg, Germany. Excellent guitars and someone I have learned a great deal from. 

Marshall Bruné - Maker, dealer, historian, and appraisals of classical guitars.

Richard Bruné - Maker, dealer, historian, and appraisals of classical guitars.

Josep Melo - Barcelona, Spain. Classical and archtop guitars.

Kris Barnett - Berlin, Germany. Luthier and maker of my preferred tuning machines.

Jim Hewett - Livingston, Texas. Maker of steel string guitars and expert repairs.

Aaron Green - Groton, MA. Luthier and broker of vintage and historic classical guitars.

Karel Dedain - Ghent, Belgium. Classical and Flamenco guitars, and excellent historical guitar plans as found in the books by Camino Verde.

Resources

Guild of American Luthiers - Educational resource for luthiers, including plans, books, and the journal American Lutherie.

American Lutherie #151 - This issue contains my article on Guitarreria Ottenschlag, as well as Tobias Braun's article on the solera of Santos Hernández. 

Barnett Tuning Machines - Outstanding tuning machines by Kris Barnett.

Visesnut Cases - My preferred guitar cases.

Romanillos Guitar Books - Books by José Luis Romanillos and Marian Harris Winspear.

Melo Guitars Editions - Fantastic book: José Luis Romanillos, Guitars, The Guijosa Period.

Orfeo - Online magazine by Alberto Martinez

Camino Verde Press - Books on Vicente Arias, Santos Hernández and more.