Alison Gopnik, Ph.D. is a professor of psychology at the University of California at Berkeley and a leading cognitive scientist. She is past president of the Society for Philosophy and Psychology and is the author of more than seventy papers on philosophy, psychology, and children's early learning. She has also written for The New York Review of Books and The Times Literary Supplement. Mother of three, she lives with her family in Berkeley, California. Andrew N. Meltzoff, Ph.D. revolutionized the field of child psychology with his discoveries about how much infants know, learn, and remember. He is a professor of psychology and the University of Washington, and his research has been featured in Time, The New York Times, and museum exhibits worldwide. He and his wife, Dr. Kuhl, live with their daughter in Seattle, Washington. Patricia K. Kuhl, Ph.D. is the world's leading authority on speech development and is a professor of speech and hearing at the University of Washington. She was one of six scientists invited to present their research at the White House Conference on Early Learning and the Brain in 1997. Her recent findings on language acquisition and why parents speak "motherese" to their children made national headlines. She and her husband, Dr. Meltzoff, live in Seattle.