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Born from Surya Wanaatmadja and Elizabeth Jonathan, Wanaatmadja spent his childhood and youth at Surabaya.
He pursued his studies in fashion, earning himself degrees at Mueller & Sohn Privat Mode Schule in 1977 at Düsseldorf, Germany and then the London College of Fashion in 1982 at London, England. In 1983, Biyan worked at Enrico Coveri di Firenze, Italia. After living in Europe for more than 15 years, Biyan's family asked him to come back to Indonesia and start his own private label. Working in a small atelier in Surabaya, Biyan produced and retailed his first clothing line.
Now Biyan holds 3 label: BIYAN (est. 1984), Studio 133 by Biyan (est. 1985), and (X) S.M.L in a business partnership (est. 1999). A custom-made Biyan gown now retails from a price of USD 4,500 to USD 10,000.