Dermatology Guidelines, first published in 1999, immediately became a bestseller, and rivalled sales of Antibiotic Guidelines and Cardiovascular Guidelines, which usually headed sales lists.

The second edition was published in 2004, the third in 2009, and the fourth in 2015. John Marley chaired the expert groups for two editions of Dermatology Guidelines.

Management Guidelines: Developmental Disability was first published in 1999. An initiative of Associate Professor Nicholas Lennox when he was head of the developmental disability unit at The University of Melbourne, the project continued after he moved to The University of Queensland. Editor of the first and second versions, Nick Lennox contributed as a consultant to the third edition, which was prepared by TGL editor Dr Susie Rogers and published in 2012 as an eBook as well as a print version – a first for TGL.