Alan Alda: Actor, not yet famous for M.A.S.H., who directed the sketches on Free To Be and appeared on “William’s Doll” and “Atalanta.”

Harry Belafonte: Singer, actor, and activist who appeared on “Parents Are People.”

Mel Brooks: Director, writer, comedian, and actor who appeared on “Boy Meets Girl.”

Dick Cavett: Talk-show host who performed “My Dog Is a Plumber.”

Carol Channing: Broadway star who performed “Housework.”

Billy De Wolfe: Broadway and That Girl actor who appeared on “Don’t Dress Your Cat in an Apron” and “Dudley Pippin and the Principal.”

Herb Gardner: Marlo Thomas’s boyfriend at the time and a prominent playwright who participated in the brainstorming sessions behind Free To Be.

Dionne Gordon: Marlo Thomas’ niece. Now Dionne Gordon Kirschner, a line producer for television.

Dan Greenburg: A playwright and screenwriter, author of the poems “Don’t Dress Your Cat in an Apron” and “My Dog Is a Plumber.”

Rosey Grier: Former defensive tackle for the Giants and Rams. Sang “It’s All Right to Cry.”

Carol Hall: Singer-songwriter and, later, composer of The Best Little Whorehouse in Texas. Wrote three songs on Free To Be: “Parents Are People,” “It’s All Right to Cry,” and “Glad to Have a Friend Like You.”

Sheldon Harnick: Lyricist best known for Fiddler on the Roof. Wrote “Housework” and the lyrics for “William’s Doll.”

Bruce Hart: Lyricist best known for his work on Sesame Street. Husband of Carole Hart. Wrote lyrics for “Free To Be … You and Me,” “Sisters and Brothers,” and “Girl Land,” and co-produced the music on Free To Be.

Carole Hart: Producer of Free To Be. Also wrote “Grandma,” adapted from her own children’s book. Wife of Bruce Hart.

Stephen Lawrence: Musical director for Free To Be. Also wrote the music for “Free To Be … You and Me,” “When We Grow Up,” and “Sisters and Brothers.” Later a longtime music director for Sesame Street.

Robert Levine: Longtime lawyer for the Free To Be project.

Trey McIntyre: Choreographer of “Ladies and Gentle Men” for his eponymous Boise, Idaho, dance troupe.

Robert Morse: Actor who voiced Dudley Pippin. Best known now as Bert Cooper on Mad Men.

Ursula Nordstrom: Legendary children’s editor at Harper & Row. Met early in the brainstorming process with Marlo Thomas to try to find suitable children’s stories for the album.

Letty Cottin Pogrebin: Feminist activist and part of the original Ms. magazine editorial staff. Consultant on Free To Be … You and Me.

Carl Reiner: Writer and actor. Co-wrote “Boy Meets Girl.”

Mary Rodgers: Composer and children’s author, best known for her book Freaky Friday. Contributing editor on Free To Be, she co-wrote or adapted “Ladies First,” “William’s Doll,” and “Girl Land.” Daughter of legendary composer Richard Rodgers.

Colin Romoff: Broadway actor and Marlo Thomas’ vocal coach.

Diana Ross: Ex-Supreme turned solo star. Sang “When We Grow Up” on the album.

Scott Shukat: Junior agent at William Morris and a driving force behind assembling much of the talent on Free To Be.

Shel Silverstein: Poet and author of The Giving Tree, A Light in the Attic, and more. Friend of Herb Gardner and Marlo Thomas. Wrote “Helping” and the poem from which “Ladies First” was adapted.

Tom Smothers: Comedian and performer of “Helping.”

Gloria Steinem: Founding editor of Ms. magazine, feminist activist.

Peter Stone: Screenwriter and book writer for Broadway, best known for the movie Charade and the musicals 1776 and Titanic. Friend of Herb Gardner and Marlo Thomas, he participated in initial brainstorming sessions and co-wrote “Boy Meets Girl.”

Marlo Thomas: Actress best known for her sitcom That Girl. Thomas created and spearheaded Free To Be … You and Me, and appeared on eight of its 18 tracks.

Charlotte Zolotow: Children’s book author and former assistant to Ursula Nordstrom. Wrote the book William’s Doll.