Speight took a teaching position at his secondary school and studied science part-time under
Frederick Hutton, graduating in 1891 with a
Bachelor of Science. When Hutton retired his teaching position from Canterbury College in 1903, Speight succeeded him as a lecturer, while retaining his teaching position at Boys' High for some more years. During his career, Speight published 130 papers and reports, which span a wide area of earth science. Geographically, he mostly published
Canterbury topics, but also the
Kermadec Islands and the
New Zealand Subantarctic Islands (which he visited in 1907). His papers on past worldwide climate changes and their causes gained him international attention, and he was elected to fellowships of the
Geological Society of America and the
Geological Society of London. He was also a fellow of the
New Zealand Institute, and was the organisation's president from 1933 for two years and during that time, the name was changed to Royal Society of New Zealand in reference to the
Royal Society based in
London. He was awarded the
King George V Silver Jubilee Medal in 1935. ==Family and death==