Roddy is a member of the following professional bodies:

The Institute of Professional Goldsmiths
The Society of Heraldic Arts
Who's Who in Gold and Silver

Here are links to some other useful websites:
Neil Oliver - Seal Engraver
Rainnea Graphics - Custom Sgian Dubhs, Kilt Accessories and Jewellery
Laurent Granier - European Heraldic Artist
Clan Duncan website - Clan website
The American College of Heraldry
The Sports and Model Shop - Dingwall

Here is the site that provides information regarding Scottish crests and who is eligible to wear them:
The Court of the Lord Lyon