Wellmont Medical Associates Has Selected Two Experienced Health Care Leaders For Top Administrative Posts. Vyvyan Deriouen Has Been Named Vice President And Chief Executive Officer While Karen Williams Has Been Promoted To Vice President And Chief Operating Officer. President And Ceo David Brash Said The Practice Has Experienced Considerable Growth In Provider Numbers. Wellmont Medical Associates Has 137 Physicians And 92 Advanced Practitioners Serving More Than 80 Locations.