Mark Zilner, the owner, President and Chief Executive Officer of nationally-known Diamond
Pharmacy Services and its related companies, all based in Indiana, is one of the inductees of
the Indiana County Business Hall of Fame, Class of 2022.
Mark was born and raised in Indiana, a son of Diamond pharmacy business owners Gib and Joan
Zilner, graduated from Indiana Area Senior High School and earned a degree in pharmacy from
He joined his parents’ business as the director of operations at age 24 in 1991 and has overseen
its growth as a dominant force in national institutional pharmacy service over the past three
The standalone pharmacy that Mark’s parents bought in 1970, Diamond Drug Store on the 600 block
of Philadelphia Street, soon was complemented by Diamond Pharmacy Services. Mark’s dedication to
growing relationships with corrections departments and medical groups led the pharmacy services
division to become the nation’s largest provider to correctional facilities by 2001. Today,
Diamond has clients in 47 states.
Other spinoff businesses under the Diamond banner include RemedyRepack Inc., an FDA-certified
repackager of prescription medication; Diamond Distribution, a wholesale division set up in 2005
to provide larger orders of stock to customers; SapphireHealth LLC, an electronic health record
software company begun in 2009; and InnovaHealth LLC, a retail mail-order pharmacy and
healthcare platform also started in 2009.
The company also has grown from that single downtown drugstore to include outlets along Oakland
Avenue, a sprawling multi-building administrative and distribution complex in Indiana County
Commerce Park in White Township, as well as satellite locations in Lancaster, PA, Leesport, PA
and Westerville, OH.
Mark is credited with developing a culture of caring in the Diamond divisions, where
administrators and employees have fostered an environment of kindness, giving and charity on an
ongoing basis. They support one another in times of struggle and assist community organizations
in times of need, including the YMCA Miracle League, Alice Paul House, American Cancer Society,
Four Footed Friends, and Indiana County Community Action Program. In 2020, they took over the
Angels’ Wings program as the primary sponsor and organizer.
The Zilner family and the companies have partnered with Indiana County agencies in a mission to
educate the public of the dangers of prescription drug abuse, co-sponsored “take back” events to
collect and dispose of unused and unwanted medications to curb abuse and raised funds for
Under Mark’s leadership, Diamond Drugs Inc. has grown its workforce to almost 1,100 people and
is the third-largest employer in Indiana County. With revenue reported at $391 million in 2017,
Diamond was ranked No. 13 on a Pittsburgh Post-Gazette list of top privately held companies in
the region. They have been named to the Top 500 and Top 5000 Fastest Growing Independently Owned
Companies. In 2019, Diamond was awarded Employer of the Year for Indiana County by the
Tri-County Workforce Investment Board, Industry Partner of the Year by the Pennsylvania Assisted
Living Association, and they received honorary recognition from the Chestnut Ridge Chapter of
the American Red Cross. Pittsburgh Business Times honored Diamond in 2018 with the Family
Mark has recently received the Pittsburgh Smart 50 Award from the Smart Business Network in
2021. He was named to the Top 100 People in Business by Pennsylvania Business Central and was
recognized among the Top Healthcare Leaders list for 2019 by the International Forum on
Advancements in Healthcare. In 2017, Mark was the Northeastern School of Pharmacy Distinguished
Alumni of the Year. He also served on the Pennsylvania State Board of Pharmacy as well as the
Indiana County Chamber of Commerce and the IUP Research Institute.
The Indiana County Chamber of Commerce welcomes Mark Zilner, one of the Class of 2022 inductees
of the Business Hall of Fame.