Leonard Guarente

Background

Leonard (Lenny) Guarente is Novartis Professor of Biology at MIT. Together with then-postdoc Shin-ichiro Imai and others, he showed in 2000 that yeast Sir2 is an NAD⁺-dependent histone deacetylase — linking metabolism (via NAD⁺) to chromatin and longevity.

Key contributions

• Discovery of the NAD⁺-dependent deacetylase activity of Sir2 (the founding member of the sirtuin family).
• Demonstrated that Sir2 overexpression extends yeast lifespan.
• Trained much of the next generation of sirtuin/longevity researchers, including David Sinclair and Matt Kaeberlein.
• Co-founded Elysium Health, a direct-to-consumer NAD⁺-precursor supplement company.

Influence

Guarente’s sirtuin work converted “aging” into a tractable biochemical target and established the NAD⁺-sirtuin axis as a central node of modern longevity research. Whether sirtuin-activating compounds reliably extend mammalian lifespan remains debated; the underlying biology is fundamental.

Related entries

Sirtuins, NAD+ precursors, David Sinclair.