I have 20 years of experience, and specialize in the field of colon and rectal surgery with specific knowledge in the areas of colonoscopy, colon cancer and hemorrhoid and bowel treatment. I have published on such topics as colon cancer, colonoscopy, polyps, and screening. I have testified on incisional abdominal hernia. I am well qualified from an academic and practical, private practice experience to testify as an expert regarding colorectal surgery, colonoscopy, colon cancer, and anorectal and hemorrhoid disease, treatment, and complications.