Conrad Austin Plimpton, 82 (born August 26, 1943), of Princeton, New Jersey, and Tucson, Arizona, passed away on April 19 at Tucson Medical Center Hospice, Peppi’s House, from pneumonia and related health complications.

Conrad led a remarkable life characterized by enthusiasm, deep commitment to loved ones, and an enduring spirit of adventure. He will be deeply missed by many. His vibrant energy, generous spirit, and unwavering devotion to family and friends left a lasting impact on all who knew him.

Conrad is survived by the center and love of his life, his wife of 62 years, Grace Ann; his sons, David (Stacy), Conrad II “Steve” (Rebecca), and Michael; and his daughter, Sarah Liebowitz (Marc). He is also survived by eighteen grandchildren, three great-grandchildren, his younger brother Jonathan (Anne), and two nephews. He was preceded in death by his parents, Fred and Joanna Plimpton, and two of his sons, John and Peter.

In recent years, Conrad was most active as an angel investor in projects that inspired him and as a donor to organizations that reflected his values, most notably MSDx, Flourishing Arizona, and the Child Health Institute of New Jersey, where he served as founder and trustee.

Prior to his “retirement”—though he never truly retired—Conrad’s career focused on investing, innovation, and entrepreneurship, with a particular appreciation for applied science, life sciences, and technology.

Conrad earned his AB from Harvard College, an MBA from the University of Chicago Booth School of Business, and a Master of Astrophysics from the University of Chicago.

He began his career at McKinsey & Company, focusing on technology investments, and later worked as an investment banker at Kuhn Loeb & Co. In 1975, he founded Plimpton & Company, dedicated to buying and building businesses, with a strong emphasis on supporting people and entrepreneurs.

Over the course of his career, Conrad invested in, owned, and chaired the boards of numerous businesses, including Exide Electronics, which he grew in the 1990s from $50 million in revenue to $600 million, primarily through new product innovation. The company was ultimately sold to Eaton.

In 1981, he led the buyout of Inolex, where he served as Chairman and CEO until 2013. Today, Inolex is an ingredient design firm serving the health, beauty, and wellness industries and remains an independent, multigenerational family investment. Conrad was also instrumental in the acquisition of Troy Corporation, a company focused on safe preservation technologies, in 1983, and remained a long-term investor and director until its eventual sale to Arxada. In 2018, he co-founded Sustainable Botanicals International, focused on traceable, sustainable natural ingredients for the beauty industry.

Conrad was a well-known and widely respected figure in the cosmetics industry. He will be remembered for traveling tens of millions of miles to meet people, attending conferences and trade shows, and consistently building relationships across the global personal care community.

In his free time, Conrad was an active member of the Rotary Club of Tucson, participated in the Physical Sciences committees at the University of Chicago, and was involved with the Tucson Jewish Community Center. He previously served as a Trustee of the Center of Theological Inquiry and as a member of Harvard University’s Major Gifts Committee.

Conrad was also a member and elder of Winnetka Presbyterian Church in Illinois, the Church of the Holy Comforter in Kenilworth, Illinois, and later a longtime member of Nassau Presbyterian Church in Princeton, New Jersey, as well as St. Philip’s in the Hills Episcopal Church in Tucson, Arizona.

A celebration of Conrad’s life will take place on May 8, 2026 at 10:30 AM at Nassau Presbyterian Church, 61 Nassau Street, Princeton, NJ 08542. A reception will follow.

Donations in Conrad's honor may be made to:

Child Health Institute of New Jersey
89 French Street
New Brunswick, NJ 08901

or

Misericordia Home
6300 North Ridge
Chicago, IL 60660