D... Luthiers (21st C.)

Sonny D is the brand name used by luthier, Sonny Dahlin and his son Dwayne, (Sonny is getting old and his son is taking over) of Waipahu, Hawaii. Sonny started the firm in 1969 and does mostly custom work in all scales including the superscales and all string combinations. They are known for the boxy Dreadnought shape he calls the "Bell". They have a reputation for being very good, apart from a period in the late 2000's when Sonny was cutting back on the work and Dwayne was still perfecting the art. 

Based in Broederstroom, South Africa, he started making and repairing instruments while studying architecture at the University of Port Elizabeth. Once he graduated in 1978 he started a career in full time instrument making which has always been his occupation, (not architecture). He makes all kinds of chordophone including Guitars, Basses, Mandolins, Violins and even Oods, (he may have been making Ukuleles too but he doesn't mention it on his websites.?) 

In 1988 he designed and then started making a rage of instruments he branded SmoothTalker using fairly standardised and easy to produce body parts. Again this range features Guitars, Basses and Mandolins, even a wood body Banjo but this time no Violins or Oods. He does specifically say on the website for this though, that the range includes Ukuleles using the "size 0" body size, (but it doesn't say the scale length). Since some time before 2009 his wife Debbie has also been working in the workshop on making these.

Nic Delisle is the man behind Island Instrument Manufacture and he is based at the Mile end Guitar shop in Montreal, Quebec, where he works in a kind of semi-collective with an number of other Guitar luthiers, (none of whom appear to make Ukuleles). 

His output too is primarily electric Guitars, but included in his catalogue is the e-Tiple, an electric Tiple Ukulele; and I have seen a Taropatch, basically same thing but with 2 less strings. He learned to make instruments by working for two years for Daddy Mojo a professional Cigar box instrument manufacturer, (that has made some cigar box Ukuleles in the past), and has been in business as Island Instrument Manufacture since 2011

Based in Maui, though originally for Washington State where he worked as a carpenter in the construction industry. He moved to Hawaii in 1996 and taught himself luthiery while still working in construction. He started making instruments full time in 2001, and makes Concert, Tenor and Baritone Ukuleles plus Guitars, (I've never seen a Soprano?). He uses mainly koa in his construction and has a hibiscus motif that he often uses for epaulette and central soundholes, he uses a decorated V on his headstock and often uses kiesha bracing with the wedge shaped bridge on a lot of his instruments. 

Based in Adelaide, he was a self taught luthier whose Instruments sold all around the world. They were always solid body electric, usually single pickup and often mimicking the shape of famous electric Guitars. 

He made all scales of Ukulele from Soprano to Baritone though he always described the Baritones and "Baritone or Tenor Guitar" He made things other than Ukuleles like Mandolins, Lap Steel and Tenor Guitars but not full size Guitars. 

He died in late 2012

He is from Vancouver, British Columbia and has been making Guitars since the 1970's after a 2 year apprenticeship in Spain. He is most famous for his Selmer style "Gypsy" Guitars, his Weissenborn style slide Guitars and his Harp Guitars, but over the years he has made a number of other chordophones including Harp Ukuleles and "Gipsy" Tenor Ukuleles. He is also known as a teacher of luthiery with past students including Meredith Coloma and Sonny Black