Pusztai worked at the Rowett Institute for the next 36 years, predominately studying plant lectins. During that time, he discovered glycoproteins in plants, authored over 270 research papers, published 3 books,[3] and was considered an "internationally renowned expert on lectins".[4] He was made a Fellow of the Royal Society of Edinburgh in 1988 and has received fellowships from the Leverhulme Trust.[2] Árpád Pusztai was married to Dr Susan Bardócz, with whom he worked at the Rowett Institute following their. He has two daughters from his first marriage and a stepson from his marriage to Dr. Bardócz.[5] He died at his home in Aberdeen on December 17, 2021, at the age of 91.[6]