Dr Brennan is Clinical Research Fellow at Johnson & Johnson Vision Care Inc., where he has been since 2011. For 16 years prior to that he co-directed a privately-owned research consulting company and, before that, was an academic faculty member at the University of Melbourne, reaching the level of Reader. During this time, he was also a visiting scholar at Stanford University under a Senior Fulbright scholarship. Dr Brennan is a Max Shapero Memorial Lecture Awardee of the American Academy of Optometry and a councilor of the International Society for Contact Lens Research. He was recently named one of the 30 most influential people in the contact lens field in the premier global trade journal, Contact Lens Spectrum. He has over 400 publications, including over 100 peer-reviewed papers as well as educational articles, peer-reviewed conference abstracts, industry reports and patents, and has delivered more than 400 lectures internationally, including paid invited presentations in over 30 countries.
He is known for multiple contributions to vision research including the following: correcting numerous errors in measurement of contact lens (CL) oxygen transmissibility (Dk/t) and shaping interpretation of on-eye oxygen transport, leading to the end of the great Dk/t race; developing the Atago hand refractometer for clinical measurement of soft CL water content; initiating a new field of vision research― ‘blur adaptation’; conceiving the celebrated Liou-Brennan model eye, which has been variously described as “the benchmark among model eyes”, “the most anatomically accurate model eye in ophthalmology” and the “industry standard” (the model eye is the basis of Zeiss’ aspheric IOL series); development of the Medmont corneal topographer, the standard worldwide for orthokeratology practice and described as the most accurate instrument of its type; authoring the first controlled-randomized peer-reviewed publication of silicone-hydrogel CLs; identifying the surprise major contact lens parameter associated with CL discomfort― surface friction; driving development of groundbreaking optical designs for myopia control; and pioneering evidence-based understanding of efficacy in myopia control.