One cannot organize such a vast body of work without the cooperation of curators, art dealers, collectors, historians, and friends. The following lists all who have assisted me in this project. I am eternally grateful for their follow-up, knowledge, and support. This work would not be possible without acknowledging the initial research by Edith Karolina Baumgartner who sadly and recently passed away. We owe her a special debt for devoting ten years of her life to reveal a wealth of previously unknown material on Harta. I am fortunate that I was able to meet with her in Salzburg, and discuss my grandfather, and his contribution to Austrian Expressionism. A special thank you goes to my son, Thomas Heller, who has greatly contributed, especially regarding the technical aspects of the website. A special mention goes to Dr. Felizitas Schreier, President of the Klimt Society who has graced me with her friendship, and knowledge, and always seems to be there. I must mention Dr. Franziska Lettowsky who made it convienient for me to access Harta’s papers in the Archive of the Salzburg Festival. Dr. Eva-Jandl-Jörg from the Salzburg Museum has also provided valuable assistance. Finally, a big hug and kiss to my partner for life, Penny who has to listen to me chirp on a daily basis regarding the challenges of building this site.
Victor Baillou, Salzburg, Dr. Walter Albrecht, Museum of Military History, Vienna, Dr. Andrea Amort, Theater Museum, Dr. Edith Baumgartner, Salzburg, Primavera Boman-Behram, London, Georg Becker, Vienna, Stephan Bstieler, Austria, Claudia Casebolt, USA,Deborah Diamond, USA,Nikolaus Domes, Wien; Dr. Elisabeth Dutz, Albertina, Vienna, Lydia Eder, Albertina Museum, Vienna, Ruth Eder, Munich, Germany, Dr. Heike Eipeldauer, Leopold Museum, Vienna, Jean Forman, USA, Verena Gamper, Leopold Musuem, Nancy Glaser, Augusta Museum of History, Samantha Goldberg, USA, Dr. Thomas Haberstatter, Domquartier, Residenz Galerie, Salzburg, George Hamilton, USA, Dr. Barbara Herzog, Museum der Moderne, Salzburg,USA, Dr. Martin Hochleitner, Director Salzburg Museum, Claus Jesina, Galerie 16, Wien; Dr. Eva Jandl-Jörg, Salzburg Museum, Dr. Kerstin Jesse, Belvedere Museum, Vienna, Martin Janda, Vienna Vienna, Jane Kallir, Gallery St. Etienne, NYC, NY, Ingrid Kastel, Albertina, Vienna, Barbara Kramreither, Museum of Military History, Vienna, Mr. Michael Kaufman, Salzburg, Dr. Alexander Klee, Belvedere Musuem, Vienna, Dr. Hansjörg Krug, Christian Nebehay, Vienna, Wolfgang Krug, State Gallery of Lower Austria, Wolfgang Roth, Vienna; Dr. Frederick Lehner, Vienna, Dr. Franziska Maria Lettowsky, Salzburg Festival Archives, Victoria Martino, Salzburg Festival Archives, Thomas Matyk, Museum of Applied Arts, Vienna, Beth Moore, Telfair Museums, Savannah, GA, Carmen Müller, Belvedere Museum, Vienna, Denise Nichols, USA, Dr. Helga Rabl-Stadler, President Salzburg Festspielhaus, Jacinto Regalado, USA, Martin Robb, England, Stella Rollig, CEO, Belvedere Museum, Vienna, Dr. Felizitas Schreier, President, Gustav Klimt Society, Vienna, Mr. Andrew Shea, USA, Mr. John N. Smith, Free State Press, England, Dr. Franz Smola, Belvedere Museum, Vienna, Dr. Ursula Storch, Wien Museum, Dr. Claudia Suppan, Galerie Martin Suppan, Vienna; Dr. Elisabeth Thaller-Nowak, LENTOS Kunstmuseum, Linz, Austria, Mary Frances Vogler,Rebekah Wade, GA, Roland Widder, Kunsthandel Widder Gallery, Vienna.