Nick Martin has made important contributions in the genetics of human behaviour and complex diseases. He played a major role in founding the Australian Twin Registry and has used it in a series of very large twin studies of personality, intelligence, alcoholism, asthma and endometriosis that have made important findings and set international standards for power and rigour. He has attracted major funding from NIH, EU, NHMRC, a CRC and industry and heads a research group of over 70. He has won international awards, published over 450 papers, and is the most cited author in psychology and psychiatry in Australia.