Dia L. Michels is an award-winning internationally published science and parenting writer, she is the author or editor of over a dozen books for both children and adults. Her books have been translated into Spanish, Dutch, Hebrew, Chinese, and Korean. A popular speaker, she lectures frequently at conferences, universities, libraries, and schools around the country. She teaches classes on mammal reproduction and lactation at children's and science museums around the U.S. and is a commentator for Public Radio, International. Her articles have been published in People, Parenting, Mothering, Parents, Baby Talk, Family Fun, Nurturing, and the Washington Post. She lives in the Capitol Hill neighborhood of Washington, DC, with her husband, Tony Gualtieri, their three children, and four cats and a dog.

Andrew Barthelmes, illustrator of If My Mom Were a Platypus, and designer of I Was Born to Be a Brother and many other projects, is a New York based illustrator and graphic designer. A graduate of The School of Visual Arts, his illustrations have appeared in publications such as The New Yorker, Ladies' Home Journal, Street & Smith's Sports, and The Wall Street Journal. In addition to the Platypus book, he also illustrated Herman the Loudmouth. He has been a children's book designer for Random House, Inc. and is currently creating new children's books for Reader's Digest. He lives in Peekskill, NY with his wife Barbara, and new baby, Julia.