Leadership Team

Gregory D. Clark - CEO Gregory D. Clark


Greg joined ZOOK in 2011. Greg has over 25 years in leadership positions in companies large and small. He is responsible for the strategic direction of ZOOK and dedicated to positioning the company for long term profitable growth. Prior to ZOOK he has held leadership positions for Roper Technologies, Parker Hannifin, NSK Corporation, and ITT. Greg is a visionary leader with a keen sense for driving business growth, strategy and innovation.

Richard Clark - VP, Global Marketing & Sales Richard Clark

VP, Global Sales & Marketing

Richard joined ZOOK in 2000. Richard has over 40 years in the rupture disk industry. He has successfully led and managed a global sales & marketing team and expanded a worldwide channel partner network. Prior to ZOOK, he was President & Owner of Rupture Discs International Limited. He developed and produced multiple new graphite products and continuously streamlined the company’s manufacturing process.

Cameron Holmes - Vice President & General Manager Cameron Holmes

VP & General Manager, Metal Business Unit

Cam joined ZOOK in 2005. Cam has over 13 years in the rupture disk industry and over 25 years in operations and managing high performing teams. Cam manages the Metal Business Unit at ZOOK including production and product development to ensure the timely delivery of high-quality, innovative products. Prior to ZOOK, he was the General Manager of Cequent Towing Products. Cam is instrumental in providing inventive product solutions to an ever-changing marketplace.

Julie L. Critzer - Vice President, Finance & Administration
Julie L. Critzer

VP Finance & Administration

Julie joined ZOOK in 2015. Julie has over 25 years experience working in global manufacturing / distribution for public and private companies. She leads ZOOK’s global organization structure for financial, IT and HR functions. Prior to ZOOK, she worked as VP Finance for Laszeray Technology, LLC, and Worldwide Controller of Alpha Technologies, a Roper Industries company. She has demonstrated unwavering leadership in support of ZOOK’s global growth.