He has been an editorial cartoonist to the National Business Review since 1975, specialising in political satire. As a biologist he is interested in animal populations, animal behaviour and diseases and did his PhD on hedgehog ecology. He has published material on butterfly evolution in Sicily, behaviour of sparrows, magpies, possums, starlings, mange mites, animal roadkill, flax flowering, cabbage tree disease.
He has been a science columnist for Wellington's Dominion Post newspaper since 2001.
Brockie takes a strong interest in refuting popular myths, like danger to humans from 1080 poison used to control possum populations.