In 2009, after 23 years in the NHS and academia, Mark left his post as clinical senior lecturer at the University of Sheffield to become a full time trainer. He qualified with honours from Bristol Medical School in 1986, and trained in public health before being awarded a national fellowship by the MRC. He used the principles he learned from Tim to publish numerous journal articles and now enjoys teaching those skills to others. He has been a co-tutor on Tim's Train the Trainers course. He is an accredited Myers Briggs trainer, and one of only a handful of people in Europe accredited by the Enneagram Institute to teach authorised workshops.