Abstract: Three myrmecologists (R.H. Crozier, R.W. Taylor and H.T. Imai) with different academic backgrounds and interests met in Australia in 1975. They later established an air-drying technique for ant chromosome observations and surveyed hundreds of Australian ant species centred around the Jack jumper Myrmecia pilosula, and proposed the so-called "Minimum Interaction Theory" (a new theory for chromosome evolution). This is an account of their work together.