Stephanie was born in Cairo to an Austrian diplomat and a Syrian painter. They relocated to a different country every 3-4 years. She's lived in Egypt, Romania, Italy, Austria, Sri Lanka, Scotland, Jordan, and the US. Her middle name, pronounced "Noor", is the Arabic word for "light, brightness". She speaks fluent Arabic, German, Italian and English.

Nur graduated from the University of Stirling in Scotland with an MSc in Psychology with Honours, completing the master's degree in three years instead of five.

In 2011, she worked for the United Nations High Commissioner for Refugees in Jordan, tasked with aiding the humanitarian response to the Syrian refugee crisis.

She started acting in the small theaters of Vienna, and was cast in her first film role in, Risse im Beton (Cracks in Concrete). The film was nominated at the Berlinale Film Festival, and also received an Austrian Film Academy Award in 2014.

Stephanie was cast in a supporting guest role in Taylor Sheridan's western drama series, 1883, opposite Sam Elliot. Sheridan cast her again in Special Ops: Lioness, this time with a major series-regular role in the successful CIA drama. She gained much praise and an ardent fan-base from her role as Aaliyah in Special Ops: Lioness. That same year she also received international recognition for starring in the third installment of the classic franchise, My Big Fat Greek Wedding 3.

In between jobs, she also translates scripts, subtitles, treatments and festival submissions, for film production companies in Europe.