Ryntz has been with Visteon since 2000 and leads the company's Advanced Materials Engineering Group, which has been involved with such innovations as the Long Life Filtration System, which is the winner of a 2004 PACE Award, and a negative-thermoformed full-instrumental panel.
Ryntz has held key technical positions with Ford Motor Co., DuPont Automotive Coatings and Akzo Coatings. She is the current secretary-treasurer of the Federation of Societies for Coatings Technology. She has published more than 75 articles, edited or co-authored three books, and been awarded 28 patents. She also has won the American Chemical Society's Roy W. Tess Award in Coatings and the FSCT's highest honor, the George Baugh Heckel Award.