Before starting her own band she sang and played keyboards for Norwegian black metal band Ancient from 1996-1997 and during those same years she was the touring keyboard player for Swedish symphonic metal band Therion. She was also the live keyboardist for Dimmu Borgir, the most successful black metal band to come out of Norway, having toured with them all over the world in support of their, Enthrone Darkness Triumphant album. She also did one european tour with Children of Bodom in 1998, playing keyboards for them while their own keyboardist Janne Wirman was busy with school. She was married for several years to guitarist Alexi Laiho, who plays lead guitar for both Sinergy and Children of Bodom. Although no longer together, they still remain very good friends and bandmates.

She was born in Los Angeles, California to a Korean father and a German-American mother who was a jazz singer. When she was only a year old her mother accepted a job offer to sing in Japan, where they went on to live for one year in the town of Kawasaki, near Tokyo. They moved back to Los Angeles in 1980 and eventually relocated to Chicago (her mother's birthplace) where Kimberly was raised for most of her childhood.

Goss started her career in music very early, debuting as a singer for the undergound band Avernus at the age of fifteen. She went on to write and publish her own underground extreme metal fanzine at the age of sixteen, interviewing legendary bands like Emperor, Darkthrone, Mayhem and Bathory just to name a few. Still only seventeen, she moved to Norway two months before her eighteenth birthday to pursue an offer she received to play in the band Ancient. After recording one album with them, they went on to tour with bands like Dark Funeral and Bal-Sagoth. During this same time she was also asked to play keyboards and sing backing vocals on tour with Therion in support of their, Theli album. While playing in Therion during parts of 1996 and 1997, she toured with bands like Amorphis, Sentenced and My Dying Bride as well as playing major european festivals like Dynamo Open Air. In 1997 she was also asked to join Dimmu Borgir as a session keyboardist and tour with bands like In Flames, Krisiun and Kreator. During the tour with In Flames in august of 1997, she met guitarist Jesper Strömblad and together they formed the first incarnation of Sinergy. She moved to Sweden in 1998 to rehearse with the first line-up of Sinergy and record their debut album, Beware The Heavens. Shortly after that recording she relocated once again and moved to Finland, where she currently lives today. Together with original band member Alexi Laiho, they went on to reform Sinergy with an entire cast of finnish musicians. Over the years Sinergy has teamed up to tour with bands like Nightwish, Angra, Dark Tranquility, In Flames and Children of Bodom. They've also played some of the biggest metal festivals in the world including Wacken Open Air. Their success in Japan led Kimberly to receive an offer to write a monthly column for over 3 years in Burrn! magazine.

Goss has also made contributions to other bands, writing some lyrics for Children of Bodom on two of their albums and lending her voice to guest sing on albums by Warmen, Eternal Tears of Sorrow and most recently Kylähullut.