MARSHFIELD, MA – Alden Johnson, 64, died July 8 from what his family believes to be a massive heart attack.

Johnson was a chemical and metallurgical engineer who held several patents at Speedline Technologies before retiring from the company about four years ago.

Most recently, he was chairman of the Marshfield Agricultural Commission, a Eucharistic minister at Trinity Episcopal Church, a Mason in Scituate, and on the board of directors of the William Lawrence Camp in New Hampshire.