Ken Parsons is author of the book ‘Human Thermal Environments’ which is in its 3rd Edition. He is Emeritus Professor of Environmental Ergonomics at Loughborough University in the UK having taught and researched in the area of Human response to thermal environments (heat stress, cold stress, thermal comfort..) for over 35 years. He is active in the subject and well placed to report on fundamental principles, application and recent developments in the subject. He holds international positions in China and on British, European and ISO committees.