Harold A. Hallstein III, 70, of Lincoln, Ma, died on October 7th of heart failure after a period of declining health. An Owners Representative in construction, Harold had a long career managing projects in a variety of venues throughout New England. Harold was born May 6th, 1950 in Cleveland Heights, Oh, the son of Harold Hallstein Jr., a sales manager with TRW, Inc., and Sue Palmer Hallstein, homemaker and golf champion. He was the third of four siblings; Sue of Willoughby, Oh. Ann Lee of Easthampton, Ma. and Robert, deceased. Known as "Joe" to his friends, Harold attended both public school and Hawken School in Gates Mills, OH. He went to Carnegie Mellon University and graduated in 1972 with a BFA in sculpture. He married artist and classmate Susan Richards in 1973. Harold's talents led him to create his own construction business after moving to Brookline, Ma in 1974. Prior to founding the Hallstein Company Inc., Joe worked for the town of Brookline, and later for Parencorp Inc. a real estate development firm. Harold and Susan moved to Lincoln, Ma in 1993 after renovating two homes in Brookline. Harold was involved with charitable projects at the Codman Community Farm and he served on their Board of Directors. He was also on the Board of the Cambridge Insight Meditation Center, and acted as a construction advisor for The First Parish Church in Lincoln. One of his favorite projects was the award winning Forest Refuge in Barre, Ma., where he met and became friends with many respected teachers in Buddhism. Harold was an avid fly-fisherman, enjoying yearly trips to the Miramichi river in Canada to fish for Atlantic salmon. He built his family home in Lincoln, Ma and until a few days before his death continued to hold conference calls with clients. Harold is survived by his wife Susan and leaves his two children, Harold A. Hallstein IV from Boulder, Co, and Jocelyn Adams, and his son-in-law Trevor Wissink-Adams, from Jamaica Plain, Ma. A memorial service and celebration is being planned for spring of 2021. Contributions in lieu of flowers can be made in his memory to the Lincoln Land Conservation Trust at www.lincolnconservation.org. Proceeds benefit the Flint's Farm field heritage, which abuts his resting place in the Lincoln Cemetery. Arrangements are under the care of Dee Funeral Home & Cremation Service of Concord.