Private ADHD Assessment in London, Therapy, Treatment, and private psychiatrist appointments. Our priority is to deliver high-quality ADHD services, including video consultations. We are offering private consultations, only by appointment. Dr Stefan Ivantu M.D is a Consultant Psychiatrist CCT. He completed his specialty training in Oxford UK, having clinical and leadership experience in developing ADHD services. Dr Ivantu expertise is in ADHD, complex cases, and personal development. With his knowledge and support from the Royal College of Psychiatrists, he was responsible for leading the development of a new ADHD service for the NHS, and later the private ADHD Specialist service.