I have 26 years of experience, and specialize in the field of pulmonary and critical care medicine with specific knowledge in the areas of occupational lung disease, radiographic imaging and NIOSH B reading. I have published on such topics as silicosis, asbestosis and coal workers’ pneumoconiosis. I have testified 15 times on topics such as silicosis, asbestosis and coal workers lung disease. Since 1990, I have made over ninety invited international trips to develop research activities, lecture, support the international labour organization and world health organization, and collaborate with international colleagues on the recognition and prevention of occupational respiratory disorders.