In 1988-89, Dr. Chalmers was one of the first Oregon ophthalmologists to volunteer with NW Medical Teams, performing cataract surgery in Oaxaca, Mexico. He has continued his involvement with many subsequent trips to Mexico and Central America. In 2007 and 2009, Dr. Chalmers and Dr. Bock traveled to Coya, Peru to perform strabismus surgery on children and adults. They were among the first physicians from the United States to provide this operation in this area.
Like many of the EHNW doctors, Dr. Chalmers has been a leader in his profession. He has served as President of the Clackamas Medical Society. He is a member of the American Academy of Ophthalmology and has served on their Practicing Ophthalmologists Advisory Committee for Education. The advisory committee reviews and edits Academy educational publications to ensure their relevance to practicing ophthalmologists. He is also a Past-President of Vision Northwest, a non-profit organization that serves the needs of the blind.
Dr. Chalmers has served as President and is currently Medical Director of the local chapter of Amigos de las Americas, a non-profit organization that sends young adults to Latin America to work on public health projects in rural communities. When he was a teenager in 1972, Dr. Chalmers went to Honduras with this group. His daughter Caroline also participated in the program.