I’m a professional biologist, now retired. My area of expertise is environmental physiology, especially circadian and circannual rhythms, and the role of hormones in regulating such rhythms. .

Resident of Baltimore County, Maryland. Main interests are birds, native plants, insects. Member of the American Ornithological Society, Maryland Ornithological Society, Maryland Native Plant Society, and Maryland Entomological Society. Editor and webmaster for the Birder’s Guide to Maryland & DC (https://birdersguidemddc.org/), a project of the Maryland Ornithological Society.