Born 1977 in Warsaw/Poland.
Lives in Warsaw. Studied cultural management and organization at the Institute for Culture, Warsaw University from 1998-2001 and interdisciplinary studies in the liberal arts from 1995-2001 with a Masters degree (thesis on Popular taste towards chosen artistic projects presented at the CCA, Ujazdowski Castle in 1998 – 2001).
Worked as a journalist for the Polish daily newspapers _ycie and Gazeta Wyborcza from 1994-1997.
Since 1998 curatorial assistant and since 2001 curator at the Center for Contemporary Art, Ujazdowski Castle.
Numerous exhibitions from 1999-2001 include: Look at Me, Zoe Leonard, Tony Oursler, Lost and Found, David Hammons, Sam Taylor-Wood, Komar & Melamid, Fabric of Fashion, Mathilde Papapietro (all Ujazdowski Castle).
In 2002 Agnieszka Sienkiewicz-Nowacka was a fellow for art coordination at Akademie Schloss Solitude to coordinate and curate the exhibition and festival »A Need For Realism. Solitude in Ujazdowski«. Since 2003 she is the coordinator for the artists exchange program at Ujazdowski Castle.