John Campbell

He is a British YouTuber and retired nurse educator known for his videos about the COVID-19 pandemic. As of December 2022, his YouTube channel had 2.6 million subscribers and over 581 million views. He holds a diploma in nursing from the University of London, a BSc in biology from the Open University, an MSc in health science from the University of Lancaster, and a Ph.D. in nursing from the University of Bolton. He received the Ph.D. for his work on developing methods of teaching via digital media such as online videos. Campbell worked as a nursing educator at the University of Cumbria, and has experience as an emergency department nurse. He has also tutored healthcare workers in Cambodia and India. He is the author of the nursing-related bioscience textbooks Campbell's Physiology Notes and Campbell's Pathophysiology Notes. A review in Emergency Nurse magazine said that the latter textbook contained "excellent [and] inexpensive notes on the causes, pathophysiological changes, and clinical features seen in disease processes". In 2008, he established a YouTube channel to provide educational lectures on topics in health science and nursing.