Ulli began his career in the music industry after completing studies in marketing advertisement and communication. He took his first steps as a DJ in November 1978 at the dance school Simon in Bad Homburg, where he succeeded the notable Michael Cretu. By 1980, Ulli had secured a position as the resident DJ at the Vogue club, which would later be renamed Omen, a venue known for its significant impact on the history of electronic music. In 1982, he transitioned to the prestigious Dorian Gray club, where he remained until 1987, when he was succeeded by Sven Väth.

During the years 1985 to 1989, Ulli expanded his repertoire by working as a producer and freelance DJ. In 1990, he produced the single "Rain" for Amir and contributed to the project Smoking For Fun's "Dale Fuego." The following year, he collaborated with Danny B, producing the single "Life Can Be So Groovy," as well as tracks for L.O.D., including "Follow Me" and "Surprise I'm Allright."

In 1992, Ulli remixed French artist Axel Bauer's single "Cargo" and produced several tracks, including Brenda Hale's "Hey Mr. Love," Danny B.'s "Lovely Dovey" and "Heaven," Elaine Terry's "You Got Me Turnin' Around," and Paris Red's "Promises." He held the position of resident DJ at Paramount Park from 1993 until 1998 and was also a DJ for the HR3 Clubnight (later known as XXL Clubnight) from 1995 to 2002. Ulli was a founding member of the Sound of Frankfurt.

In 1994, he produced several singles, including Fluid's "Pour un Flirt," Lamont's "Feel the Music," Paris Red's "Ain't Nobody," The Club's "It's A Love Thing," and Graphixx's "Neverending Story." He collaborated with Amir Saraf to co-produce multiple eurodance groups, including La Bouche, Le Click, Pearl, and Hysterie, working on singles like "Call Me" and "Midnight Hour," as well as tracks for Timbuli and Club X.

Ulli continued to make his mark in 1995 by remixing Marky Mark's "No Mercy" and Prince Ital Joe featuring Marky Mark's "Rastaman Vibration." He also produced Velvet Lipps featuring Rose Zone's "French Kiss." In 1996, he was involved in several projects, including Africa Islam featuring Melle Mel's "Rave Da House," Mikado's "Take Me Baby," Planet Brazil's "Girl from Ipanema," and Eddy Lawson's "I Love Music." That same year, he contributed to Faithless' radio mixes of "Salva Mea."

In 1997, Ulli produced the project Double Feature, which released the single "Get Closer." The year 1999 proved to be particularly productive for him, as he released the track "Hypnotic Tango" under the name Bell Ami. He also produced Cantara's "Persian Love Song" and several singles for D.A. 4, including "Virus," "Funzone," and "What Is Love." Other notable productions that year included Eastwood's "High Noon," F.P.I. Project featuring Tahomy's "Rich in Paradise," Rayo Verde featuring Panterra's "Donde Va?," and Rodgau Monotones' "Die Hesse Komme '99."

In 2000, Ulli launched his own trance project, Ultra, which achieved significant success with the single "Free." He also produced work for the groups Chapter & Page and Modus. In 2003, he released the single "Voodoo" as Brenner & Mitch under Urban / Motor Music and produced Piper's "Are You Ready To Rock?"

In 2005, Ulli collaborated with Frank Farian on the pop-RnB project Gift.