Adiv Johnson, PhD

Johnson's research lens centers on DNA methylation as the primary readout for biological age — the science behind the CheekAge buccal clock and Tally's consumer-facing TallyAge Test. Methodologically, he leans next-generation epigenetic clocks trained on large cohorts (the published CheekAge model uses 8,000+ adults, 200,000+ methylation sites) and frames clocks as one signal among many, having co-authored the 2024 Aging Cell treatise arguing that biological age and epigenetic clocks should be conceptually detangled.

• Lead scientist on a published, peer-reviewed clock. The CheekAge / TallyAge program has produced 6+ Tally-affiliated papers in GeroScience, Aging Cell, Frontiers in Aging, iScience, and Ageing Research Reviews — most consumer epigenetic-age tests cite a clock; Johnson's group built one and published the validation arc.
• 17-year aging-research arc, h-index 27. Active in the field since 2008, with 3,281 Google Scholar citations and 40+ peer-reviewed papers spanning DNA methylation, lipid metabolism, proteomic clocks, and bestrophinopathies — broader than most consumer-test scientific leads.
• Cross-disciplinary provenance. Mayo Clinic ophthalmology postdoc (bestrophin / retinal disease) before pivoting fully into aging biology — an unusual lineage among epigenetic-clock leads who typically come from biostatistics or developmental biology.