NEIL SHUBIN, anatomist, evolutionary biologist and paleontologist and author of Your Inner Fish and other books; professor at University of Chicago 

ROBERT HAZEN, mineralogist, astrobiologist, professional trumpeter, Great Courses lecturer and author of more than 20 books, including The Story of Earth; professor at George Mason University and research scientist at the Carnegie Institution's Geophysical Laboratory 

NEIL deGRASSE TYSON, astrophysicist, host of the Cosmos TV series, director of the Hayden Planetarium and author of 13 books, including Astrophysics for People in a HurryDeath by Black Hole: And Other Cosmic Quandaries and Origins: Fourteen Billion Years of Cosmic Evolution

MARY ROACH, author of six books, including Packing for Mars: The Curious Science of Life in the Void; Gulp: Adventures on the Alimentary Canal and Stiff: The Curious Lives of Human Cadavers

THOM HOLMES, writer, editor, music historian and author of more than 20 books about evolution, dinosaurs and other prehistoric life

THOM HOLMES, writer, editor, music historian and author of more than 20 books about evolution, dinosaurs and other prehistoric life

ALEX FILIPPENKO, widely-cited astrophysicist, lecturer on Great Courses series, member of two cosmology research teams whose leaders shared the 2011 Nobel Prize in Physics, and nine-time professor of the year at the University of California at Berkeley

ANDREA WULF, author of five books, including Founding Gardeners: The Revolutionary Generation, Nature, and the Shaping of the American Nation and The Invention of Nature: How Alexander Von Humboldt Revolutionized Our World

MICHAEL R. CANFIELD, entomologist and author of Field Notes on Science and Nature and Theodore Roosevelt in the Field; lecturer on evolutionary and organismic biology at Harvard

KATHERINE FREESE, theoretical physicist and author of The Cosmic Cocktail: Three Parts Dark Matter; professor at the University of Michigan and director of the Nordita Institute for Theoretical Physics, in Stockholm

JEFF WELLS, ornithologist, boreal forest conservationist and author of the Birder's Conservation Handbook, Boreal Birds of North America and Maine's Favorite Birds 

AMY STEWART, author of nine books, including Wicked Plants: The Weed That Killed Lincoln's Mother & Other Botanical Atrocities and The Earth Moved: On the Remarkable Achievements of Earthworms

JOEL SARTORE, photographer, endangered-species conservationist and author of seven books, including Rare: Portraits of America's Endangered Species

FRANCIS FRENCH, space historian, director of education at the San Diego Air & Space Museum and author of three books on space exploration, including Into That Silent Sea and In the Shadow of the Moon

MARIA SIBYLLA MERIAN, (1647-1717), naturalist and scientific illustrator centuries ahead of her time and author/illustrator of five books on plants, insects and other animals

IAIN STEWART, geologist, BBC science-documentary presenter, host of Earth: The Biography series, member of the scientific board of UNESCO's International Geoscience Program, and director of the Sustainable Earth Institute; professor at the University of Plymouth in England

EDWARD O. WILSON, biologist, world-leading ant expert and two-time Pulitzer Prize-winning author of 28 books, including The Ants, On Human Nature and Letters to a Young Scientist; research professor emeritus of biology at Harvard.

DAVID ATTENBOROUGH, conservationist, zoologist, legendary broadcaster and author of 25 books, including The Life of Birds, The Life of Mammals and The Living Planet

DAVID ATTENBOROUGH, conservationist, zoologist, legendary broadcaster and author of 25 books, including The Life of Birds, The Life of Mammals and The Living Planet

JANE GOODALL, primatologist, anthropologist, the world's foremost expert on chimpanzees and author of 26 books, including 40 Years at Gombe and Hope for Animals and Their World

GEORGE SCHALLER, preeminent field biologist and mammalogist and National Book Award-winning author of 14 books, including The Serengeti Lion and The Mountain Gorilla; recipient of National Geographic's Lifetime Achievement Award 

BILL BRYSON, writer, honorary member of the Royal Society of science and author of 21 books, including A Short History of Nearly Everything and A Walk in the Woods

RACHEL CARSON, marine biologist, world-changing environmentalist and author of seven books, including Silent Spring and The Sea Around Us

JAMES PROSEK, artist, conservationist and writer of 13 books, including Ocean Fishes, Bird, Butterfly, Eel and Trout of the World; winner of a Peabody Award for a PBS documentary based on his book Eels

SYLVIA EARLE, marine biologist, explorer and author of dozens of books, including The World Is Blue: How Our Fate and the Ocean's Are One

JOHN ALLEN PAULOS, mathematician and author of nine books, including Innumeracy:  Mathematical Illiteracy and Its Consequences and the newly released A Numerate Life: A Mathematician Explores the Vagaries of Life, His Own and Probably Yours.

DAPHNE SHELDRICK, conservationist, elephant expert and author of Love, Life, and Elephants: An African Love Story

DAVID CHRISTIAN, driving force behing the Big History concept (teaching all 13.8 billion years of history instead of just the last 5,000 years) and author of three books, including Big History: Between Nothing and Everything

DAVID QUAMMEN, magazine writer and author of 10 books, including The Reluctant Mr. Darwin and The Song of the Dodo

JENNIFER OULLETTE, science writer and author of four books, including Black Bodies and Quantum Cats: Tales from the Annals of Physics and The Calculus Diaries: How Math Can Help You Lose Weight, Win in Vegas, and Survive a Zombie Apocalypse

JAMES BULLOCK, astrophysicist and expert on dark matter, galaxy formation and the Milky Way; professor at the University of California, Irvine

JANET BROWNE, science historian and author of two definitive volumes on Charles Darwin, Charles Darwin: vol. 1 Voyaging and  Charles Darwin: vol. 2 The Power of Place; professor at Harvard

IAN TATTERSALL, paleoanthropologist and curator emeritus at the American Museum of Natural History and author of 13 books, including The Brain: Big Bangs, Behaviors, and Beliefs and Extinct Humans

ELISE ANDREW, blogger and science popularizer; founder of the I F---ing Love Science Facebook page and website

LEE DURRELL, naturalist, author and conservationist, and husband GERALD DURRELL (1925-95), one of Britain's most beloved naturalists, zoologists, television nature hosts and authors; founders of the Jersey Wildlife Trust

SEAN CARROLL,  theoretical physicist and author of The Particle at the End of the Universe and The Big Picture; research professor of physics at Caltech

BERND HEINRICH, biologist, artist and best-selling author of 19 books, including Mind of the Raven and Winter World; professor emeritus at the University of Vermont

LISA RANDALL, theoretical physicist and author of four books, including Dark Matter and the Dinosaurs and Higgs Discovery: The Power of Empty Space; professor at Harvard

CLAUDINE ANDRE, conservationist, bonobo researcher, founder of the Lola ya Bonobo sanctuary in the Republic of Congo in Africa and star of the documentary Bonobos: Back to the Wild

CARL SAFINA, writer, ocean conservationist, MacArthur Fellow and author of seven books, including Eye of the Albatross: Views of the Endangered Sea and Song for the Blue Ocean: Encounters Along the World's Coasts and Beneath the Seas

KIM TODD, author of Chrysalis: Maria Sibylla Merian and the Secrets of Metamorphosis and Tinkering with Eden: A Natural History of Exotic Species in America

MARK CARWARDINE, zoologist, whale expert, conservationist, wildlife photographer and author of more than 50 wildlife, travel and conservation books, including Last Chance to See

DAVID M. CARROLL, artist, conservationist, turtle expert, MacArthur Fellow and author of five books, including Swampwalker's Journal: A Wetlands Year and Self-Portrait with Turtles: A Memoir

REBECCA SKLOOT, science writer and author of The Immortal Life of Henrietta Lacks

TOM WESSELS, ecologist and author of five books, including Reading the Forested Landscape: A Natural History of New England and The Granite Landscape: A Natural History of America's Mountain Domes, From Acadia to Yosemite

STEPHEN JAY GOULD, paleontologist, evolutionary biologist and author of 27 books, including  Wonderful Life: The Burgess Shale and the Nature of History and collections of essays such as  I Have Landed: The End of a Beginning in Natural History

PIOTR NASKRECKI, entomologist, photographer, documentarian of vanishing species and author of The Smaller Majority and Relics: Travels in Nature's Time Machine

RICHARD FORTEY, paleontologist, natural historian, television presenter and author of seven books, including Life: An Unauthorized Biography. A Natural History of the First Four Billion Years of Life on Earth and Survivors : The Animals and Plants that Time Has Left Behind

MEAVE LEAKEY (above) and RICHARD LEAKEY, wife and husband paleonanthropologists, and daughter LOUISE LEAKEY, also a paleoanthropologist; many discoveries and writings among them, continuing the tradition of Richard's parents, Louis and Mary Leakey

STEVEN WEINBERG, Nobel Prize-winning theoretical physicist and recipient of the National Medal of Science; professor at the University of Texas in Austin