Marilyn was born in the Bronx, the second child of Malvina and Elso Masiero. She attended The Fashion Institute of Technology, where she received an Associate Degree in Textile Science. She continued her studies at New York University receiving a Bachelor of Science Degree in Education, and went on to get a Master of Arts Degree in Education from NYU.After teaching for the N.Y.C. Board of Education for twenty two years and receiving another Master' Degree in Art Therapy from the College of New Rochelle, she opened a practice in Sarasota, Florida.
In Sarasota, Marilyn joined the Sarasota Bay Rotary where she became President for 2003-2004. Upon retiring, and moving to Larchmont, Marilyn continued her Rotary activities serving as Club President of the Larchmont club and in 2015-2016 was named District Governor of District 7230. She also became a proud member of the Paul Harris Society as well as the Arch Klumph Society. Her motto in Rotary was "Lend A Hand".
Marilyn had many other interests: she was on the Varsity Fencing Team at NYU and she loved traveling, going to museums, concerts, and the opera. Recently Marilyn became a Patron of the Textile Conservation Department of the Metropolitan Museum of Art. In 1971, while at an international Fencing Championship in Vienna, she married Richard Gradkowski, who she is survived by.