Hailed by American Record Guide as "one of the world's greatest violists", British violist Helen Callus has performed as a recitalist, chamber musician and concerto soloist she has delighted audiences in major cities.   Ms. Callus was appointed to the faculty of The University of Washington at the age of 26. She currently serves as Professor of Viola at the University of California, Santa Barbara and is much in demand all over the country as a visiting professor, teaching master classes at some of the nation's leading schools of music.She has written numerous articles for both Strad and Strings magazines. Herself the subject of numerous feature articles, Strings stated in its 2005 article titled 'The Advocate' that Ms. Callus might just be "the best friend the viola world ever had."