Bertil was born in Horten, Norway in 1951. He grew up listening to Fats Domino, Little Richard and New Orleans Blues from the 50s. Although he considers the harmonica his main instrument, Bertil is a true exponent in the Professor Longhair style of genuine boogie-woogie / rhumba rock piano.
Three years of classical piano lessons were fortunately not enough to divert Bertil’s interests away from big hit makers of the day, namely Fats Domino and Little Richard. While Bertil was growing up, the big old black living room piano served him well whilst trying to copy his heroes. Great was the joy when his left hand finally mastered a somewhat steady beat. Praise from friends and scorn from his piano teacher left him frustrated, but Bertil’s will to keep on learning from his heroes was unswerving.
Portable keyboard instruments weren’t the norm in the 60s; those that existed were few and far between and expensive. It wasn’t until 1970 that the first Fender piano entered the living room. Although the sound wasn’t very boogie-woogie oriented, it lent itself more than willingly to jazz-rock and funk! The blues took a back seat and Bertil started emulating and learning from his new heroes, Sly & The Family Stone.
Many bands came and went over the next 10 years. Landing a steady job in a dance band was an important period in his career. Not only did it enable him to pay his dues and hone his chops, but it also gave him the musical confidence to give the music his own touch – his personal style. In the meantime the blues had come back to Bertil and he entered the stage with his own repertoire in 1980. After a few years of writing songs with Norwegian lyrics he changed to English and hasn’t looked back since.
A list of Bertil’s recording merits on both harmonica and piano include: J.P West (Danish / Norwegian artist), O.B. Johnson (USA, Norway), Ø. Ødegården (Norway), Paul Gannon (USA), and just recently boogie-woogie and New Orleans-piano on the Tiger City Jukes’ (Norway) critically acclaimed release ”Ride in Style”. Besides being a busy studio session man, Bertil often fills spots in such bands as: Blue Steel, Bullmilk, Larsen’s Last Chance, Gumbo Cats, Knut Nordhagen’s Blue Pack, and the list goes on. In 1980 Bertil backed Louisiana Red when he played in Horten.
The year 2000 album ”Mumbo Jumbo” on Flipside Records contains 14 tunes, including 10 original New Orleans-style tunes penned by Bertil.
Amongst other venues, Bertil has be seen at festivals in both Sweden and Denmark (Åmål Blues Fest and Umeå Blues Fest, Sweden) and lots of festivals in Denmark with Midt-Fyn and Skagenfestivalen on top). He’s toured up and down Norway and enjoyed overwhelming receptions in Denmark with Blue Steel and Bullmilk.  
In February 2002 he finished a tour including Arctic Blues Festival joining a boogie-woogie jamboree with Diz Watson and Dr. Bekken.
In March that same year he received standing ovations playing with piano legend Eddie Bo on the Storyville stage in New Orleans. 
Spending most of 2003 behind the PC-keyboard, and making his debut as a writer, Bertil only joined main blues events in Norway. In 2004 he made his musical skills a priority and performed at several festivals in Norway: Notodden Blues Fest, Vossfestival, and Hell Blues Festival. On the Hell Blues Fest in Trondheim he joined an all star boogie-woogie jamboree with such world-wide greats as Bob Seely, Axel Zwingenberger and Barry Cuda.
In 2004 he released the much acclaimed CD "The Ticklers" with piano colleague Dr. Bekken. His main touring band, besides The Ticklers (and a tribute band for Elmore James) is Gumbo Cats – a quartet consisting of  piano / harmonica (Bertil Jøreng), tenorsax (Bård Melhus), drums (Olav Gustavsson), and bass (Lars Endrerud).
2006 has been busy stomping the keys in Elmore James Tribute Band and attending festivals with blues/soul/rock greats like Solomon Burke, Jeremy Spencer and Ray Davies. He also did a rerun as backingpiano for Louisiana Red; 28 years later. Late fall in 2006 was spent playing solo acts in Gran Canary – Spain.