Dr. Joan Cartwright, age 74, began singing at the age of 4 and never stopped. An explosive jazz and blues singer, composer, and educator, she has performed in the U.S. and Europe for 30 years—and she holds a doctorate in business administration. A fervent advocate for women in music, she spearheads Women in Jazz South Florida, Inc., a nonprofit educational organization that promotes female musicians globally. She’s written and published 14 books, including her own original music. She also publishes two magazines—MusicwomanMagazine.com and MusicmanMagazine.com—hosts a podcast, and puts out a monthly newsletter. As if that wasn’t enough for one person, she teaches public speaking four days a week at a local college. I interviewed this fascinating, multitalented woman hoping to find out the secret of her nonstop energy.