Born in Elmhurst, Queens, New York, United States, Eichler began his career in the mailroom as an apprentice to the publicist Lee Solters in 1963, and worked his way up to account executive at Solters' firm Solters, O'Rourke and Sabinson. Following admission to the Association of Theatrical Press Agents and Managers union in 1969, he worked as publicist on productions of Hello, Dolly! , George M! and Hair. He also promoted several major off-Broadway hits including Paul Zindel's Pulitzer Prize-winning The Effect of Gamma Rays on Man-in-the-Moon Marigolds, the Elaine May-Terrence McNally double-bill "Adaptation/Next " with James Coco, Harold Pinter's The Tea Party and The Basement, the long-running rock musicalYour Own Thing, Andre Gregory's experimental adaptation of Alice in Wonderland, and Tom Stoppard's The Real Inspector Hound. Eichler also represented several noteworthy "flops" during this period including Shelley Winters' only attempt at playwrighting, One Night Stands of a Noisy Passenger with Robert De Niro, Sally Kirkland and Diane Ladd; Tina Howe's The Nest with Jill Clayburgh; Leland Hayward's last production The Mother Lover with Eileen Heckart; and Larry Kramer's Four Friends with Brad Davis.
Later theatrical work and productions
In 1970, he began a long association with playwright Tom Eyen, starting with The Dirtiest Show in Town and continuing with the prison comedy Women Behind Bars, The Neon Woman starring Divine, Why Hanna's Skirt Won't Stay Down with Helen Hanft, The White Whore and the Bit Player, and the Tony Award-winning musical Dreamgirls. He also worked with actor-director-playwright Charles Ludlam and helped establish Ludlam's Ridiculous Theatrical Company as one of the major forces of New York's avant-garde theatre, with such cult hits as Camille, Bluebeard, Stage Blood, Hot Ice, and the cabaret play The Ventriloquist's Wife. In 1974, he became co-producer with Geraldine Fitzgerald of her one-woman musical show Streetsongs, which had three separate extended theatrical runs over the next several years both on and off-Broadway, a TV version on PBS and an original cast record album. He also represented Fitzgerald for all of her other ventures for the rest of her stage and film career. He helped steer the course of an unusual 1975 rock opera entitled The Lieutenant, based on the My Lai Massacre, which began as a small workshop production at the Queens Theatre in the Park, before traveling to Broadway. It only managed to run for nine performances, but was nominated for four Tony Awards including Best Musical and Best Actor in a Musical. He promoted the 1976 Jerry Rubin self-help book Growing Up at Thirty-Seven. In 1978, he was associate producer of the Broadway musical Timbuktu!, an African-American adaptation of the Chet Forrest-Robert Wright musical Kismet, starring Eartha Kitt, Melba Moore and Gilbert Price. He also toured with the show for two years as press agent and continued to have a long association with Kitt. He next publicized the Broadway production of Martin Sherman's play Bent with Richard Gere. In 1980, he began a year-long tour as press agent with the first national company of The Best Little Whorehouse in Texas starring Alexis Smith, following which he settled in Los Angeles. He arranged the very first AIDS benefit for APLA Health in 1983, which was a special Midnight performance of Women Behind Barsat the Roxy Theatre. In 1994, he produced an original musical, Swanson on Sunset, about the attempts of Gloria Swanson to create a musical version of her film hit Sunset Boulevard, with writer Dickson Hughes and actor Richard Stapley. It played an extended engagement at the Hollywood Roosevelt Hotel Cinegrill.
In 2010, Eichler produced a six-CD retrospective covering the seven-decade career of vocalist Jane Harvey, including previously-unreleased recordings she made with Duke Ellington, Les Paul and Ellis Larkins. In 2020, he co-produced a stage revival of Women Behind Bars at the Ricardo Montalban Theatre in Hollywood, which was also filmed. He is currently executive producer of a documentary film "Boulevard!", about Gloria Swanson's failed attempt to turn Sunset Boulevard into a musical.