Clark Lindenmeier, a loving husband, devoted father, proud grandfather, and brilliant scientist, passed away on January 11, 2025, at the age of 63. Born on August 11, 1961, Clark lived a life marked by love, dedication, and a deep passion for learning.
Clark was a devoted husband to Robin, with whom he shared 41 years of marriage. Their partnership was built on mutual respect, care, and an unwavering commitment to each other. Clark’s primary focus was always on meeting Robin’s needs, ensuring she knew how deeply he cherished and valued her.
As a father, Clark’s greatest joy was spending time with his children. He understood the importance of being present in their lives and prioritized his family above all else. His love for his children extended beyond his role as a parent—he was their teacher, mentor, and constant source of support.
Clark was also a proud grandfather, bringing joy and wisdom to the lives of his four grandchildren. He was a loving and attentive grandfather, always ready with a hug, a kind word, or a fun activity to share with them.
A great big brother to his sister. Clark’s bond with his family was a cornerstone of his life. He approached his relationships with an open heart and a selfless spirit, always willing to lend a hand or offer a word of encouragement when needed.
Professionally, Clark was a brilliant scientist whose curiosity never waned. He achieved a Bachelor’s Degree and 2 Masters Degrees from Washington State University and Eastern Washington University.  He was highly respected by his peers and colleagues. Clark joined PNNL in 1985 and was an advisor in the Energy and Environment Directorate. He made valued contributions to the mission of PNNL, the Department of Energy, and the nation. He took on challenging tasks involving complex client relationships, difficult regulations, and frequent foreign travel.  His friendship, advice, expertise, experience, and management skills were greatly valued. Clark’s ability to approach problems with a childlike sense of wonder and a sharp, analytical mind made him a true innovator and a valuable mentor to many.
In every aspect of his life, Clark was a doer—constantly in motion, tackling one task after another with unparalleled organization and attention to detail. Whether it was at work, at home, or with friends, Clark was someone who could always be relied upon to follow through and get things done. He was a true friend, always ready to help without hesitation, and his generosity of spirit touched countless lives.
Clark’s legacy will live on through his family, friends, colleagues, and the countless lives he impacted with his kindness, intelligence, and unyielding love. He will be dearly missed here and around the world.
He is survived by his wife Robin, children Ryan Lindenmeier (Amanda) and Sarah Roake (Matt), grandchildren Cora, Clayton, Jonathan, and Connor, his sister Charlene Somerville (Kent), and a host of family and friends who will miss him deeply. He is preceded in death by his parents Charles and Barbara Lindenmeier.
Clark’s memory will forever live in the hearts of all who knew him. May he rest in peace, knowing that his legacy of love, service, and inquiry will continue to inspire and guide those who carry his memory forward.
A celebration of life for Clark is being planned for the spring. Family, colleagues and friends will be notified when arrangements are finalized. Donations may be made to the ARC of the Tri-Cities or any animal rescue organization.