He complemented his studies by taking master classes and lessons with Mstislav Rostropovich, János Starker, Steven Isserlis, Boris Pergamenschikow, Miklós Perényi, Valentin Erben (Alban Berg Quartet), William Pleeth, Zara Nelsova, and Ferenc Rados.
Janos Starker | János Starker | János Kádár | János Arany | Janos Prohaska | János Négyesy | János Fadrusz | Träume sind stärker | János Varga | János Vajda | Janos Trail | János Sebestyén | János Saxon-Szász | János Pilinszky | János Nagy | János Kis | János Horvay | János Görbe | János Csonka | János Bródy | János Apáczai Csere | A. Starker Leopold |
They have collaborated with many artists including cellists János Starker and Yehuda Hanani, pianists Santiago Rodriguez, Cyprien Katsaris and Rudolph Buchbinder, tenor Ramón Vargas, and guitarists Narciso Yepes, Sharon Isbin, David Tanenbaum and Manuel Barrueco.
The long list of known and unknown artists with whom The Step has worked includes Pete Seeger, Milt Hinton, Paula Robeson, Janos Starker, Ronnie Gilbert, Holly Near, Buffy Sainte-Marie, Richie Havens, Guy Davis and independent rock phenomenon Ani DiFranco.
Tchivzhel has performed with many great artists including Yo-Yo Ma, Emanuel Ax, Vladimir Spivakov, Gidon Kremer, Nadja Salerno-Sonnenberg, André Watts, János Starker, Gil Shaham, Olga Kern, Nicolai Demidenko, Joshua Bell, Bella Davidovich, Yuri Bashmet, Evelyn Glennie, Pete Fountain, Sharon Isbin, and Doc Severinsen.
Leonard Rose called Matz, "perhaps the greatest cello theoretician in the world." Janos Starker said, "Rudolph Matz's dedication and expertise has produced much needed material for the young cellist."
Kammer studied at the Folkwang Hochschule from 1977 to 1984, cello with Maria Kliegel and Janos Starker.
Starting cello at a young age, his principal teachers included Richard Kapuscinski, Bernard Greenhouse, Jane Cowan (in Edrom), and Janos Starker.