A Hildegarde Withers Mystery

Stuart Palmer is a mathematics teacher with 25 years of experience teaching boys and girls in 5 very diverse schools and has taught all of the current New South Wales Mathematics courses in Stages 4, 5 and 6 numerous times. He holds a Bachelor of Arts (Mathematics) and Diploma of Education from Macquarie University in Sydney, Australia, and a Graduate Certificate in Education from the University of Canberra in Bruce, Canberra, Australian Capital Territory. Stuart has been a Head of Department in 2 schools for 14 years and is currently working with pre-service mathematics teachers at the University of Sydney, Australia. [Source