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Harvard Health Experts and Contributors
List of Experts

Lisa Zakhary, MD, PhD
Contributor

Salim Zerriny, MD
Contributor

Eric Zhou, PhD
Contributor

Peter Zimetbaum, M.D.
Contributor

George S. Zubenko, MD, PhD
Contributor

Randall M. Zusman, MD
Contributor

How is PSA used to monitor prostate cancer?

Effects of sleep deprivation

Progressive relaxation techniques for insomnia

How to test for sleep apnea: At home or in a lab

How sleep deprivation can harm your health

Extreme heat endangers older adults: What to know and do

Want to cool down? 14 ideas to try

What is a PSA test and how is it used?

Blood sugar–friendly fruits if you have diabetes

Gratitude enhances health, brings happiness — and may even lengthen lives