Dr. Karp has expertise in all areas of plastic surgery. He has interest in aesthetic and reconstructive surgery of the face, breast, and body. He has developed and popularized short-scar breast reduction techniques. He is on the cutting edge of the development of new surgical procedures to correct the tissue excess after massive weight loss. He is the principal investigator at NYU for the Inamed silicone breast implant adjunct study. He has an interest in both flap and implant breast reconstruction. As a trained microsurgeon he performs all flap reconstructions including perforator flaps.