Already at the age of five, Ingolfsson appeared in a performance on Icelandic TV, and she made her solo orchestral debut in Germany at the age of eight.
She has been a guest soloist with some of the world’s leading orchestras, including the Philadelphia Orchestra, St. Louis Symphony, Vancouver Symphony, the Budapest Philharmonic and National Symphony Orchestra of Washington, D.C.
In 1998, she won a Gold Medal at the International Violin Competition of Indianapolis as well as being a prize winner at the Concert Artists Guild competition and the Paganini International Violin Competition.
In 1999, National Public Radio's Performance Today named Ingolfsson Debut Artist of the Year praising her "remarkable intelligence, musicality, and sense of insight."
In recital, she has performed throughout the United States and abroad, notably at the National Gallery of Art in Washington, D.C., Cleveland Museum of Art, Cleveland Institute of Music, La Jolla Chamber Music Society, Grand Teton Music Festival, and Reykjavik Arts Festival in Iceland.
Highlights of her 2005–2006 season include debut concerto engagements in Brazil and Russia, as well as in the United States, performances with the Louisville Orchestra, Chamber Orchestra of Philadelphia, Fairfax Symphony, Columbus Symphony and others.
Ingolfsson has appeared on many radio and television broadcasts - beginning, as noted above, with a performance on Icelandic TV at the age of five. Since then she has been seen on PBS, "CBS Sunday Morning," and Japan’s National Broadcasting Company (NHK).
She was appointed Assistant Professor of Violin at the University of Colorado at Boulder, in August 2006. She will leave this post to join the faculty at the Staatliche Hochschule für Musik und Darstellende Kunst Stuttgart in October 2008.
Judith Ingolfsson performs regularly with the Russian pianist Vladimir Stoupel.