In New York Rebecca studied voice with Judith Oas Natalucci and acting with Katarina Sergava at the Herbert Berghof Studio. At first she followed a traditional opera career as a Mezzo Soprano (Idamantes, Cherubino, Dorabella, Nicklaus, Kompnist) then from the mid-80s on as a Dramatic Soprano in the opera ensemble of Basel eventually going freelance and becoming specialized in the Wagner repertoire and the early 20th century composers (i.e. Shostakovich, Janaček, Berg, Schoenberg, R. Strauss). She performed, amongst others, at the Vienna State Opera and Volks Opera, the opera houses of San Francisco, Fenice/Venice, Liège, Amsterdam, Geneva, Basel, East Berlin, Toronto, Tokyo, Hong Kong, Melbourne, the Brooklyn Academy of Music and the festivals of Edinburgh and Bregenz, including such roles as Ariadne/ Ariadne auf Naxos, Marta/ Tiefland, Leonora/ Il Trovatore, Electra/ Idomeneo, Sieglinde/ Die Walküre, Elsa/ Lohengrin, Leonore/ Fidelio, Senta/ Der Fliegende Holländer, Hanna Glawari/ The Merry Widow, Katarina Ismailova/ Lady MacBeth of Mzensk, Marie/ Wozzeck, Die Frau/ Erwartung, Kostelnička/Jenufa and many others and worked with such conductors as Claudio Abbado, Donald Runnicles, Peter Schneider, Armin Jordan, Gerd Albrecht and directors such as Jürgen Flimm, Christine Mielitz, David Poutney, Robert Lepage. 

Rebecca met Québec director Robert Lepage in the mid-1990s when she sang Schoenberg’s ERWARTUNG for the Canadian Opera Company, Toronto. She was drawn into the theater by Lepage and and his company Ex Machina where she subsequently co-authored, sang and acted in the multi-award winning, seven-hours show THE SEVEN STREAMS OF THE RIVER OTA (Les Sept Branches de la Rivière Ota) and later the nine-hours show LIPSYNCH. Both productions toured the major theatre festivals worldwide. Rebecca worked subsequently as dramaturge and advisor on other Lepage productions while in 2003 once again singing Kostelnička/Jenufa under the direction of Christine Mielitz in Dortmund. 

In addition she became artistic and musical consultant to Lepage on Wagner’s RING CYCLE (2010-2012) and Thomas Adès’ THE TEMPEST both at the Metropolitan Opera New York, as well as the Vienna State Opera, Stravinsky‘s LE ROSSIGNOL AND OTHER FABLES at the opera companies of Toronto, Lyon and festival of Aix-en-Provence. 

2014, shortly after directing DON GIOVANNI at the Mongolian Opera in UlanBator Rebecca and her sister, the theater and opera director Beverly Blankenship, began co-directing operas. Their first productions include, in Vienna: BRUNDIBAR by Hans Krása for the Austrian Parliament (the children’s opera had been performed by the prisoners of the concentration camp Theresienstadt), Ella Milch-Sheriff's shattering Holocaust opera BARUCHS SCHWEIGEN and with the Vienna Boys’ Choir the esoteric fairytale TULIFANT (by Gottfried von Einem), in Hagen, Germany they directed Wagner's DER FLIEGENDE HOLLÄNDER and subsequently Poulenc’s DIALOGUES DES CARMÉLITES at the theaters of Krefeld and Mönchenglabach. They remounted their production of DER FLIEGENDE HOLLÄNDER / LE VAISSEAU FANTOME 2019 in France at the Opera Houses of Rennes/ Nantes and Angers. In the same year THE SEVEN STREAMS OF THE RIVER OTA was relaunched to great acclaim with Rebecca reviving her role as Ada Weber, first at the Moscow theater festival, then Québec City for the opening of Lepage’s newly built theater Le Diamant and in March 2020 at the National Theatre in London where the pandemic interrupted the planned European tour. 

When theatres reopened 2022 Rebecca sang the role of the dying abbess Madame de Croissy, in her and her sister’s revival production of Poulenc’s DIALOGUES DES CARMÉLITES. THE SEVEN STREAMS OF THE RIVER OTA was presented at the Berlin Schaubühne and at Lepage‘s theater Le Diamant in Québec City, and in 2023 at the Theatre du Nouveau Monde in Montréal. 

2023 Rebecca and Beverly directed Puccini‘s MADAMA BUTTERFLY at the theatres Krefeld and Mönchengladbach and directed LA TRAVIATA at the VNOB (Vietnam Opera and Ballet Company) in Hanoi. In January Rebecca performed again in THE  SEVEN STREAMS OF THE RIVER OTA t at the theater festival in Santiago di Chile, and in Madrid Festival de Otoño November 2024.