Guy Burton "Burt" Seibert Jr., age 82, a resident of Plaistow, NH, died unexpectedly on Wednesday, April 30, 2025. He was the beloved husband of Jacqueline (Fullarton) Seibert with whom he shared 23 years of marriage.

He was born in Dallas, TX on July 7, 1941, and was the son of the late Guy Sr. and Wilda (Jordan) Seibert. Burt was raised and educated in Texas. He earned a bachelor's and master's degree in mathematics at the University of Texas at Arlington. Burt later earned his PhD in statistics from Southern Methodist University in 1970. He was owner and operator of Statnet in Plaistow, NH for over 30 years until his retirement. His business was a statistical analysis network that specialized in the pharmaceutical industry, working alongside the FDA to get new medications approved. Burt enjoyed traveling, yard work and spending time with his grandchildren. He will be dearly missed by his family and friends forever.

Besides his wife, Burt is survived by his twin sons Chris Seibert of Scottsdale, AZ, and Clay Siebert and his wife Christie of Parker, CO, his daughter Kim Sweet and her husband Tom of Richland Hills, TX, his stepson Benjamin Clark and his wife Billie Jo Gordon of Haverhill, MA, his grandsons Timothy Sweet, Cameron Seibert and Ethan Clark, granddaughters Albanee Gigliotti, and Francesca Berube, and his brother Raymond Seibert and his wife Jeanne.

Family and friends are invited to attend a funeral service to be held on Saturday, May 10, 2025 at 10am in the chapel at Brookside Chapel & Funeral Home 116 Main St. Plaistow, NH. Interment will follow in the Plaistow Cemetery.