Answer the question at the end by quoting:

Pitchford was born in Honolulu, where he attended Catholic schools, graduating in 1968 from Saint Louis High School. He began his performance career as an actor and a singer with the Honolulu Community Theatre (now Diamond Head Theatre), the Honolulu Symphony Orchestra and the Honolulu Theatre for Youth, among others. While studying at Yale University, Pitchford performed with numerous campus drama groups, but his focus gradually turned off-campus, where he worked with the Wooster Square Revival, an experimental theatre company that offered acting opportunities to recovering addicts and alcoholics. In 1969, Pitchford returned to Honolulu as an assistant to authors Faye Hammel and Sylvan Levey in updating the popular guidebook Hawai'i on $5 and $10 A Day, and researching Trans World Airlines' Budget Guide to Hawai'i, the first of a series of guidebooks that would eventually turn into the popular series TWA Getaway Guides.
As a result of performing his early songwriting efforts in cabarets around Manhattan, he was invited to write with such composers as Stephen Schwartz, Alan Menken and Rupert Holmes. In 1979, he collaborated with recording artist and cabaret performer Peter Allen to write new songs for Allen's one-man Broadway revue, Up In One. With composer Michael Gore, Pitchford collaborated on three songs for Alan Parker's 1980 motion picture Fame; these were "Red Light," a disco hit for singer Linda Clifford; the symphonic/rock finale "I Sing the Body Electric;" and the title song "Fame," which became a multi-platinum, international best seller for Irene Cara. That song earned Gore and Pitchford an Oscar, a Golden Globe, and a Grammy nomination for Song of the Year (1981). They also received a Grammy nomination for Best Soundtrack Album for a Motion Picture, Television or Other Visual Media. When Pitchford was signed by Warner Brothers Publishing (1981) he began collaborating with a variety of songwriters. Among the first songs whose lyrics he wrote in collaboration with composer Tom Snow was "Don't Call It Love," which was first recorded by Kim Carnes on her 1981 album Mistaken Identity; the selection charted in the U.S. country singles top-ten for Dolly Parton in 1985 and was named the BMI Country Song of the Year. For the ill-fated 1981 movie The Legend of the Lone Ranger, Pitchford wrote a narrative ballad, "The Man In the Mask." This was spoken (throughout the movie) and sung (at its beginning and end) by Merle Haggard. "You Should Hear How She Talks About You," another Snow/Pitchford composition, was a Top 5 hit for Melissa Manchester for which she won the Grammy Award for Best Female Pop Vocal Performance in 1983. That same year, Pitchford, Kenny Loggins and Steve Perry wrote and composed "Don't Fight It," a Top 20 hit that was Grammy-nominated in the Best Pop Vocal Duo category. With musical director Michael Miller, he wrote the theme song for the weekly dance-music show Solid Gold (1980-88).

when did he start songwriting?

In 1979, he collaborated with recording artist and cabaret performer Peter Allen to write new songs for Allen's one-man Broadway revue, Up In One.

Answer the question at the end by quoting:

Mary Mary are an American gospel duo composed of sisters Erica Atkins-Campbell and Trecina Atkins-Campbell. Formed in 1998, Mary Mary was launched into mainstream recognition following the release of their best-selling debut album, Thankful (2000), which contained the hit single "Shackles (Praise You)". Their followup album Incredible (2002), reached number one on the Top Gospel Albums chart. Their third album, Mary Mary (2005), which contains themes the public interpreted as a channel to the group's experience, contains the worldwide hits "Heaven", "The Real Party", and "Yesterday".
The Atkins sisters, born Erica Monique and Trecina Evette, grew up in a large family with seven siblings in Inglewood, California. Their mother, Thomasina Atkins, is an evangelist and choir director at the Church of God in Christ. Their father, Eddie A. Atkins, was also a member of the Church of God In Christ, and a youth counselor, before he died in 2013. Due to their proximity in age, the two sisters grew up closer to one another than to any of their siblings: Darrell Atkins (born 1965, the only living boy- the second boy died as a child), Maliea Atkins (born 1967), Erica (born 1972), Tina (born 1974), Delisa Atkins-Brown (born 1977), Thomasina Atkins (born 1979), Alana Atkins-Jamison (born 1985), and Shanta Atkins (born 1986). Later, they would work creatively with over half of their siblings; Thomasina, Alana, Delisa and Shanta Atkins all sing background on Mary Mary's albums and during stage performances and Delisa was originally a member of the group but left before they started recording professionally due to pursuing college. Eventually, all eight Atkins children united on the Bobby Jones Gospel show on BET. During this time, Erica and Trecina entered the world of church choirs, traveling gospel shows, and television productions. The sisters enrolled at El Camino College to study voice. There they encountered the division between rigorous academic study of music versus the popular musical world. "We had to study classical and sing arias, which was fine," Erica told Times, "but the teachers would tell us if we sang anything else it would damage our instrument." In 1995 the two toured with Michael Matthews' traveling gospel shows, Mama I'm Sorry and Sneaky. Each sister subsequently toured as a backup singer for a variety of R&B acts, including Brandy.

Have any of the other siblings collaborated with them musically?
Thomasina, Alana, Delisa and Shanta Atkins all sing background on Mary Mary's albums and during stage performances