CHAPEL HILL, N.C., Aug. 12 /PRNewswire/ -- Cempra Pharmaceuticals today announced the appointment of John H. Johnson, Chief Executive Officer of ImClone Systems, a wholly-owned subsidiary of Eli Lilly and Company, to the company's Board of Directors. Mr. Johnson brings more than 25 years of biopharmaceutical executive and operational management experience, including leadership of successful anti-infective businesses and numerous flagship pharmaceutical products, to his role as an independent member of the Board.