Greg heads the microbiome team at the Waltham Petcare Science Institute, where his team investigates the role of the microbiome in companion animal health. Their work spans across multiple microbiomes, including GI, skin, and oral, and ranges from fundamental microbiology to clinical studies of health and disease. Greg has a long-standing interest in understanding the role of microbes in health and has held research positions across government, academia, and industry. His work has contributed to the development of clinical standards, nutritional products, diagnostics, and regulatory policy, and has been published in a wide range of journals.