Washington, D.C., National Gallery of Art, and elsewhere, Andrew Wyeth: The Helga Pictures, May 24, 1987-December 16, 1990, p. 143, no. 170, illustrated.,Chadds Ford, Pennsylvania, Brandywine River Museum, and elsewhere, The Helga Pictures: Then and Now, September 24, 1992-October 17, 1993.,West Palm Beach, Florida, Norton Museum of Art, and elsewhere, Andrew Wyeth: The Helga Pictures, January 13, 1996-June 29, 1997. ,Omaha, Nebraska, Joslyn Art Museum, and elsewhere, Andrew Wyeth's Helga Pictures: An Intimate Study, May 4, 2002-January 5, 2003.,Lafayette, Louisiana, University of Louisiana, Paul and Lulu Hilliard University Art Museum, and elsewhere, Andrew Wyeth: The Helga Pictures, April 21, 2004-January 9, 2005, p. 13, 73, no. 52, illustrated (also in Chinese translated publication, Washington, D.C., 2004).Over a fifteen-year period, beginning in 1971, Andrew Wyeth painted the model Helga Testorf almost exclusively and in complete seclusion. He worked tirelessly on the series, sitting for long sessions with the model, recording every feature and curve of her form. The Helga Pictures became a series so deeply important to Wyeth, he preserved the entire body of work in his studio, never seen by his peers or family for nearly two decades. Wyeth did not commit his signature to the numerous paper sheets and tempera panels depicting Helga until 1985 when the series was resolved and he eventually revealed the works to the public. Once , The Helga Pictures became a sensation, one such painting gracing the cover of Time Magazine, in August of 1986. The portfolio was received with high regard and fascination, securing the artist's position as one of the most important artists of the 20th century