Kerstin is well known in the barbershop world as an organizer, MC of many national and international events and as a singer and vocal coach in various quartets and all voice ranges, e.g. SPLASH!, GREEN EYES, CONNECTION, BAM! as well as in the choirs LADIES FIRST and HEAVY MEDAL.  

After music high school, music/vocal studies, she now works worldwide as a singer, vocal teacher, ensemble coach and chorus/orchestra director.  

In 2021 she additionally completed her 3-year training as an authorized Complete Vocal Technique teacher/ singer at the Complete Vocal Institute in Copenhagen.  This will open up further opportunities for her to work even more intensively with actors, speakers and wind instrument players. 

"What I have learned from many years of discovering through the different vocal techniques: Everyone implements them differently. It's my biggest focus to work out and develop the individual combination of methods for that person and give them the opportunity to make their voice open, multi-faceted and touching."

After several years of training in the children's choir of the Bavarian Philharmonic Orchestra, Mareike founded her first a capella ensemble while still in high school. In 2005 she became a member of the Harmunichs. For more than 5 years she has been one of the Harmunichs' Vocal Teachers, responsible for sing-ins and voice training, and teaching new choir members the ins and outs of the barbershop style. Mareike has also been singing tenor with the No Borders Show Chorus since 2014. There, as a member of the Presentation Team, she was instrumental in developing the show concept, which won the Audience Award for Most Entertaining Performance in the 2018 Sweet Adelines Harmony Classics Competition.

As a coach, Mareike focuses on bringing out an authentic performance and the individual sound of your ensemble. Her focus is on the specifics of the English language and its impact on a liberated voice. Depending on how Germans learned English and imitate American sounds, this can have positive or negative effects on the sound and overtone spectrum of the voice, the ensemble sound and synchronization.

Norbert is a founding member of BinG! where he served on the board as 2nd chairman for several years. He focussed on developing BinG! and was one of the initiators of the annual Harmony College. In 1987 he was among the founding members of Erster Kölner Barbershop Chor and with his quartet Viertakt, Norbert won the first German Barbershop Championships in 1993. In 2005 he took over the conducting of the male chorus Düssharmonie. Since 2010 Norbert conducts the women's chorus Barbershop Blend.

In 2009 he founded the mixed barbershop quartet TONIKUM, which became German champion in 2014. Currently Norbert is successful with the quartet O-Ton.

8 years ago Norbert united the medal winners of the quartet championships to form the Heavy Medal Chorus, which in a short time has become one of the best European barbershop choruses.