Kristel Aer is an organist who actively performs at churches both in Estonia and abroad. She has given recitals in Latvia, Denmark, Finland, Sweden, Netherlands and Russia. Aer also has participated at Tallinn International Organ Festival, at Estonian Academy of Music and Theatre and Klassikaraadio concert serie „Orelitund“ („An organ hour“). She has cooperated with with Estonian National Opera Orchestra, Tallinn Chamber Orchestra and several renowed Estonian interpretes such as Maano Männi, Pirjo Levandi, Sigrid Kuulmann-Martin and Juuli Lill. Kristel Aer is also regular performer at aestival concert series such as „The Sonorous Sounds of the Organs of Saaremaa“ and organ festivals in Pärnu and Narva.In 1992 Kristel Aer graduated from Tallinn National Conservatoire on conducting under the guidance of Kuno Areng, having also studied organ with Hugo Lepnurm and Ines Maidre. In 1992–1999 Kristel Aer continued studies at The Sibelius Academy studying organ under the guidance of Markku Heikinheimo and harpsichord with Anssi Mattila. In addition Kristel Aer has developed her skills at The Rojal Danish Academy of Music with Hans Fagius and has participated in masterclasses of Luigi Fernando Tagliavini, Ludger Lohmann and David Sanger.Kristel Aer has worked as an assistant conductor of youth ensemble „Kurekell“. In 1993–1995 Aer conducted mixed choir "Helsinkin Laulu" and won III prize at international competition in Czech Republic (1995). In 1997–2000 and since 2003 Kristel Aer works as an organ teacher at Georg Ots Tallinn Music School and has also developed organ teaching program of the school. Since 2001 Aer works at Institute of Theology of Estonian Evangelical Lutheran Church and has paticipated at church music program development. Kristel Aer is member of Estonian Organ Society (since 1999), she belongs to the management of Hugo Lepnurm Music Society and has also belonged to the management of organ restoration foundation of Juuru, Kadrina and Hageri churches. Since 2007 Kristel Aer leads the concert serie "Juuru Orelisuvi".Kristel Aer has been one of editors of composer Peeter Süda´s organ works and has written preface for the edition (2004). She has also releaved articles in newspapers and magazines such as „Eesti Kirik“ and „Muusika“.