Medical Doctor Associates | 7,267 followers on LinkedIn. Medical Doctor Associates is now Cross Country Locums! Visit us here: linkedin.com/company/cross-country-locums | For almost 30 years, Medical Doctor Associates has been providing physician and advanced practice professionals for a variety of placement options including locum tenens, temporary and temp-to-perm. MDA is part of the Cross Country Healthcare family of brands, a national leader in healthcare staffing and workforce solutions. We have earned the trust of prestigious facilities across the country with our dedication to quality and ongoing satisfaction.