From California’s coastal forests to the north island of New Zealand, Ph.D. alum Gordon Walker has trekked for mushrooms across hemispheres. His Instagram account @FascinatedByFungi has nearly 45,000 followers. Find out more about this social media star.

Jonathan Eisen, who embraced social media as an early adopter, has amassed more than 41,000 followers on Twitter. He has positioned himself as a national expert on microbiomes and is an outspoken critic of pseudoscience.