Johanna has had many years teaching experience and was a headteacher for 25 years in nursery, primary and middle schools. She was a founding member of NACE and is a past president of the charity. She has also served as a consultant to the Welsh Government, and as an advisor to the governments of Madeira, Denmark and Norway. She is an Honorary Member of the European Council for High Ability and a UK delegate for the World Council for Gifted and Talented Children. She was Vice President and Secretary of the former College of Teachers, an Honorary Member of the Chartered College of Teaching, and a Fellow of the Royal Society of Arts. In June 2013 Johanna was awarded an MBE for service to education in Wales.