The Caldwell Partners International Inc. announced the appointment of Nashville-based Partner John Blank as co-leader of the firm's Life Sciences and Healthcare Practice, joining Darin DeWitt at the helm of the practice. Mr. Blank specializes in recruiting board directors, CEOs and senior executives for private equity-backed high-growth healthcare, healthcare technology, managed care and provider service portfolio companies. Prior to joining Caldwell Partners, Mr. Blank held positions of increasing responsibility at several boutique executive search firms, including running the healthcare practice at DHR International.