is advancing animal health, biofuel production, and food safety through his research in microbiology. His work focuses on anaerobic microbiology and fermentations, molecular microbial ecology in gut ecosystems, degradation of plant cell wall polymers and biomass, nitrogen metabolism, anaerobic waste digestion, and antibiotic resistance genes.
Affiliations: 
Mackie is a professor in the , part of the  (ACES) at the . Mackie is also affiliated with the  in ACES and the .