Corona del Mar, CA: Mark S. Sierak 53, formerly of Sturbridge, MA passed away unexpectedly at his home on Wednesday, Nov 11th, 2020.

Mark leaves behind his beloved mother, Marie A. (Sierak) Fontaine and her husband, Paul, of Sturbridge, MA; his sister, Michelle A. Gray and her husband Eric of Charlton, MA; his brother, Michael A. Sierak and his husband, Tim Walsh of Sturbridge, MA; his nephew, Joseph Gray and his wife Emily of Sturbridge, MA; his niece, Carlie Gray of Boston, MA; and his two great nieces, Ellie and Mackenzie.

He was predeceased by his father, Simon Sierak.

Mark was born in Ware, MA and grew up in Sturbridge where he graduated from Tantasqua Regional High School.  Upon graduation, he attended Vasser College in Poughkeepsie, New York obtaining his Bachelor's degree in Social Psychology and a minor in French.  Mark moved to California where he received an additional degree from UCLA in Graphics Design.  He went on to have a successful career working several years for Sotheby's International Real Estate in Beverly Hills, CA where he was responsible for all aspects of marketing.

Mark loved living in California where he enjoyed training and completing triathlons, hiking Runyon Canyon, cooking and spending time with friends.  When he wasn't working, he enjoyed traveling, with his most frequent trips being to France, where he spent time with his extended family, as well as Italy and Spain.  He was a New England sports fanatic and loved to cheer them on from the West Coast.  Mark will be missed by so many friends and family members in Massachusetts as well as in California.

Services for Mark will be held at a later date.  There are no calling hours.