Ivan Yohan’s affinity for vocal and choral music dates back to his student days at the Parahyangan Catholic University, where he was a member of the University Choir. During his undergraduate course in accountancy, Ivan studied voice privately with Catharina W. Leimena, Avip Priatna, Binu D. Soekaman, Rachelle Gerodias and Christopher Abimanyu. He also studied conducting with Avip Priatna and Jonathan Velasco. In 2002, Ivan was chosen as one of the Indonesian delegates to the Asian Youth Choir (Japan), directed by Seiko Hazegawa and Hakwoon Yoon. This honour was bestowed upon him again in 2006 and 2007, with the choir under the direction of Chifuru Matsubara. He has been chorus master of Mascagni's "Cavaleria Rusticana" and Purcell's "Dido and Aeneas", including the Parahyangan Catholic University Choir's production of the latter. As a singer, he has performed Handel's "Messiah", First Sailor in the aforementioned Purcell opera and Sanjaya in the Indonesian opera, "Kali" by Tony Prabowo.

After completing his accounting degree, Ivan moved to Holland for his bachelor studies in classical singing. He studied voice at the Utrecht Conservatory with Henny Diemer and took composition lessons from Henk Alkema. He then pursued a master’s degree in choral conducting with Rob Vermeulen at the same conservatory. As part of his studies, Ivan completed a student exchange programme in Lithuania, where he studied choral conducting with Vytautas Miškinis and vocal performance with Algirdas Janutas. In his native Indonesia, Ivan is a conductor and music director for the Parahyangan Catholic University Choir (PCUC). In 2014, he conducted PCUC at the 51st International Choir Competition in Spittal an der Drau, Austria, and led the ensemble achieve the first prize and receive special commendation for best interpretation of a modern piece. In 2016, Ivan founded SWARA, a Brussels-based choral ensemble committed to the promotion and performance of modern a cappella repertoire. That same year, Ivan earned the "Special Award for Excellent Conducting Performance" at the Béla-Bartók 27th International Choir Competition in Debrecen, Hungary.

Ivan is also an accomplished composer whose choral compositions have been performed in concerts and choir competitions in Asia, Europe and the United States. In May 2011, he won the first prize of "Prix pour une oeuvre de création - Concours international" for his composition "Après un Rêve" at Florilège Vocal de Tours 2011, France. Some of his works have been published by Porfiri & Horváth Publishers (Germany), Earthsongs (United States) and Miela Harmonija (Lithuania/Japan).