John Ridgeon
John Ridgeon is the author of several books relating to brass techniques.
Ridgeon, John, Brass for beginners London ; New York :
Boosey & Hawkes, c1976. vi, 54 p. : ill. ; 28 cm
Ridgeon, John, Brass for beginners : treble clef piston-valved brass instruments 2d ed. London : New York ; Boosey & Hawkes, c1977. vi, 54 p. : ill. ; 28 cm
Ridgeon, John - The Physiology of Brass Playing - Brass Wind Educational Supplies and Co., 1986
As for a John Ridgeon Mouthpiece? I've never heard of one, but the above literature may help you in your quest.