American clarinetist and teacher Sonia Sielaff joined the Royal Philharmonic Orchestra in 2017 as Principal Eflat/Sub Principal clarinet. She held the position of Associate Principal/Eflat clarinet of the Norwegian Opera and Ballet Orchestra from 2010-2017.  

In addition to the Royal Philharmonic Orchestra, Ms. Sielaff regularly performs with orchestras such as the London Symphony Orchestra and Philharmonia Orchestra.

She has performed as guest principal clarinetist with the BBC

Symphony Orchestra, Oslo Philharmonic, Norwegian Radio Orchestra, Bergen Philharmonic and Odense Symfoniorkester, and can be heard on recordings with the
Royal Philharmonic Orchestra, Norwegian Radio Orchestra and Bergen Philharmonic.