Demetrius Constantine Dounis

Demetrius Constantine Dounis (1886 – 1954) was an influential teacher of violin and string instrument technique. A trained physician, Dounis focused his early medical career on treating professional musicians from the world's major symphonies. He would work with a musician for at least six months, observing the musician's technique, asking questions, and devising new exercises to indirectly address the problem.

Dounis also wrote several instructional books. In his 1921 volume The Artist’s Technique of Violin Playing, Dounis emphasized the importance of shifting and finger exercises. These were to develop the musician's mental map at the beginning of practice, after which scale drills would be more effective.

Dounis' first name is variously spelled Demetrios or Demetrius.