[1] Irene became his assistant and later replaced his role as a palaeontologist in the Department of the Interior where she received half his salary, equipment and office space because she was a woman.

[1] Originally, Crespin dreamed of becoming a musician, but after attending the Mansfield Agricultural High School she found her inspiration to become a geologist.

[2] In 1939, Crespin traveled to Java and Sumatra, Indonesia, to discuss with micro-palaenontologists who were in government service and industry, regarding the problems that existed with Tertiary correlation in the Indo-Pacific region.

[4] Crespin was invited to visit the US in 1951 to address the American Association of Petroleum Geologists and engage in a three-month tour, the first time an Australian had been asked to speak to this group.

[4][5] A fire broke out in 1953 in the Canberra offices of the Bureau of Mineral Resources resulting in many of Crespin's books and work being destroyed.