Jack is a Professor in Pediatrics and Scripps Institution of Oceanography, the Associate Vice Chancellor for Marine Science. He has authored more than 450 peer reviewed publications on microbial ecology, and co-authored “Dirt is Good,” a popular science guide to the microbiome and children’s health. He’s the President of Applied Microbiology International, won the 2023 IFF Microbiome Science Prize, and 2025 was elected to the American Academy of Microbiology.