Professor Marriott’s research commenced at LaTrobe University (Ph.D.), continued at Bristol (Postdoc) then had academic appointments at the National University of Singapore then in Melbourne at RMIT and Monash University. These latter two appointments accompanied invention of, and developments in cryogenic modulation in GC, leading to primary research in comprehensive two-dimensional GC (GC×GC), multidimensional GC (MDGC), and mass spectrometry.Our research includes device development, fundamental descriptions of GC×GC technology, and supports a broad applications base. As a platform technology, we apply MDGC and GC×GC to a diverse array of separations, including: pesticides; petrochemicals; pharmaceuticals; natural products; toxins; and foods, flavours and beverage analysis such as olfactometry, essential oils, wine, coffee, hop, fatty acids, polyphenols, food safety, herbs and spices etc. He has had visiting appointments in China, South Korea, Singapore, Brazil, and Malaysia.