People
Our People.
Our Strength.
The Onyx Valve Company is only as strong as its people, and our people have the most experience in the industry. Our people are experienced and helpful and work day in and day out to please our customers and manufacture best flow control products the industry has to offer. We encourage you to read through our profiles to get to know us.
David Gardellin, P.E., CEO
Co-founder and President of Onyx Valve Company, David is your primary technical resource for the measurement and control of slurries and other hard-to-handle fluids. He has been involved in valve engineering since starting as Chief Engineer at RKL Controls/Robbins & Myers in 1975. He holds a BSME from Drexel University and is a registered Professional Engineer in Maryland and New Jersey. He holds several patents related to pressure measurement and control, and is the author of numerous technical articles including chapters in the ISA Instrument Engineer’s Handbook and the Encyclopedia of Chemical Processing and Design.
Contact David at david@onyxvalve.com
Chuck Witherow, Vice President of Sales
Extensive background in Supervison, Project Management, Sales and Trade Shows.
Formal training, schooling and experience in Electronic/Electro/Mechanical as well as customer service support.
Chuck manages and supports Onyx Valve Reps and Customers in many countries around the world.
His professional approach, communication and customer service skills and technical knowledge is a great asset to our company and customers.
Contact Chuck at cwitherow@onyxvalve.com
Tony Aumiller, Application Engineer
Tony Aumiller holds his Bachelor of Science degree from Ursinus College. With a strong background in technical sales and customer support, Tony likes to develop relationships with his customers to gain a keen understanding of their needs, goals, and deadlines. Feel free to call or email him with your technical questions or quote requests! Residing in Southern New Jersey, Tony enjoys spending his free time with his two children, JD and Macy.
Contact Tony at tony@onyxvalve.com
Sean Conaway
Sean has an extensive background in Sales and Customer Service. Known for his inquisitive nature, Sean is eager to explore new processes, applications, and customer projects. Please feel free to contact him with any of your Technical Support Questions and for Project Quotations.
Contact Sean at SConaway@onyxvalve.com
Meredith Foster, Expediting and Traffic
Contact Meredith to check order status and for help arranging shipments to or from Onyx Valve Co including ground freight and expedited freight options.
Contact Meredith at mfoster@onyxvalve.com
Robert Delfino, Draftsman/Designer
Rob is your first contact for certified pressure sensor drawing submittals and approval drawings. He is also in charge of processing all pressure sensor orders and the design of all specialty pressure sensor projects.
Contact Rob at rdelfino@onyxvalve.com
Katherine Gifford, Accounting
Katherine is your first contact for AP, AR and credit card transactions.
Contact Katherine at accounting@onyxvalve.com
Mark Massimilla, Designer
Co-founder and Lead Designer, Mark is responsible for product design, research & development and the company’s manufacturing database. He has been involved in valve design since he started as a Designer at RKL Controls/Robbins & Myers in 1984.
Contact Mark at massimilla@onyxvalve.com
Dave Headley, Assembly Foreman and Co-founder
Dave has over 30 years’ experience building pinch valves. He has assembled, installed and repaired valves with pneumatic, electric and hydraulic actuators and positioners, and has assembled, calibrated and repaired pressure gauges, switches and transmitters.
