About Diamond Pharmacy

Our Story

One family, one focus. This is the story of Diamond Pharmacy Services at its core. From the day husband-and-wife pharmacists Gilbert and Joan Zilner purchased Diamond Drugs of Indiana, Pennsylvania, back in 1970, they focused on building a pharmacy that was simply the best. In 1983, they began servicing correctional facilities. Whether serving patients from the community, local long-term care, or correctional facilities, they knew that being the best meant superior customer care, innovation, competitive pricing, and constantly being ahead of the curve. This attitude only intensified when their son and pharmacist, Mark, joined the company in 1991.

Diamond expanded beyond one community corner drug store and became a national industry leader. In 1995, Diamond constructed a sprawling 100,000-square-foot mail-order pharmacy production facility and corporate headquarters to serve a growing list of correctional and long-term care clients. In 2001, Diamond was awarded a contract that overnight transformed the company into the nation’s largest provider of correctional pharmacy services. Today, Diamond sits atop the corrections pharmacy industry, serving roughly a third of the nation’s inmates. Diamond also remains Pennsylvania’s largest independently owned long-term care pharmacy. Corporate holdings include 2 satellite pharmacies, an institutional medical supply division, and local retail drug and medical supply stores. Diamond also oversees several subsidiary companies: RemedyRepack, an FDA-registered drug repackager, SapphireHealth, a health records software developer; and InnovaScript, a retail mail-order pharmacy.

Through Diamond’s growth and success, the Zilner family’s focus has never faltered. In addition to steadfast customer service, innovation, and always looking ahead, current president and CEO Mark Zilner continues to lead Diamond by an example set by his parents many years ago:
Work as hard as possible for your customers, your employees, and your community. This is how you become the best.