Management Team - CNC Swiss Screw Machine Parts | CNC Turned Parts
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Aneesa Muthana

President and Co-Owner

President and Owner of Pioneer Service since 1993, Aneesa learned centerless grinding in her parents’ machine shop at a very young age. The dirty jobs were soon blended with lasting lessons in business management and how to build relationships with customers, suppliers, and employees. Aneesa credits her company’s steady growth to exceptional workmanship, and her team’s ability to adapt to new industry trends and technology.

Aneesa believes the future of manufacturing hinges on promoting its sustainable growth to tomorrow’s professionals while dissolving the old adversarial mindsets of “women versus men” and “millennials versus boomers.” She regularly participates in seminars and speaking events, and serves on the board of directors of the Chicago Regional Growth Corporation (CRGC), Precision Machined Products Association (PMPA), Valley Industrial Association (VIA), and Illinois Manufacturers Excellence Center (IMEC). The mother of two sons and two grandchildren, Aneesa draws inspiration from her own mother, who never backed down from adversity or failed to put her loved ones first.


John Pack

VP of Operations

John joined Pioneer Service in December of 2017 and directs all manufacturing and building operations. His more than 20 years’ experience touches all aspects of the machining industry, from Brown and Sharp Screw Machines to the latest CNC equipment. A master of CNC programming, John’s expertise will drive Pioneer’s continuing expansion into the Swiss market in 2018 and beyond.

A lover of technology, John also works to bring out the best in his people. He has a proven track record of motivating others, leading by example, and training his team to excel. When not making chips, John enjoys watching sports and spending time with family in the northern woods of Wisconsin.


Steve Brezwyn

Senior Process Engineer

Steve joined Pioneer Service in 2002, and coordinates the effort to convert customer drawing specifications to reproducible results with an eye toward excellence and efficiency.  With more than 35 years in the screw machining industry, Steve brings experiences from nearly all facets of production –  Shipping Manager, Plant Manager, and Plant Superintendent, among others – while diving into a hands-on role with our personnel and processes.

His expertise in materials management drives our growth and fortifies our competitive advantage, helping us deliver the consistent quality our customers expect and deserve. Outside of the office, Steve cherishes time with his family, playing golf, and setting up his teammates in a spirited game of volleyball.


Chris Linhart

Quality Manager

Chris teamed up with Pioneer Service in early 2018 to apply his background with implementing and maintaining ISO, IATF, and AS9100 quality management systems certifications. His broad experience with inspection involves parts made from a variety of methods, including CNC, laser, turret, press brake, and stamping press, among many others. Chris holds several CMM and auditor training certifications, and has supervised several quality control labs and trained his teams on FOD awareness, AS9102 First Article, and PPAP.

At Pioneer Service, Chris maintains our ISO and AS9100 certifications and participates in the Engineering Change Control team, where he establishes inspection methods for new parts and performs regular reviews of all inspection methods and control plans for existing parts. His signature quality motto: “You can’t inspect a bad part to be a good part.”

In his free time, Chris enjoys running half marathons, biking, and golfing.

                                                                                                                                                                    Get in touch with our team here for quotes or questions. Let us know what you need and we’ll make it happen.



“We received your shipment of XXX-XXX. They look great and everything seems to be in spec. They also perform really well which is a huge deal for us as it's given us clarity for our upcoming product release. Thanks again for the quick turn around and all your help!”
Chris H.- Product Development
“Thank you Eric! You have saved our reputation.I am really happy that we will be able to ship them tomorrow. Thank you !!!!!!!!”
Gregory K.- Instrumentation
“You guys are the best!Thank you all for your prompt replies and support. You continue to impress me.”
Mike U.- Aerospace/Defense Company
“Thank you Eric! You have saved our reputation.I am really happy that we will be able to ship them tomorrow. Thank you !!!!!!!!”
Gregory K.- Instrumentation
“We are very pleased with the outcome of the first bushing Pioneer Service produced. I sent an e-mail to James Sass and informed him we will be sending a second bushing we will be needing.”
David M.- Firearms Manufacturer
“My compliments to you and the team for hitting a home run!”
Gene D.- Automotive Aftermarket Manufacturer
“Attached is the new PO … You guys are doing a great job and on time delivery and quality are superb. Keep up the good work.”
Eric H.- Power Industry
“I see your commitment to quality and your deliveries are excellent. I look forward to continue building this relationship.”
Brad D.- Oil & Gas
“I am pleased to let you know that everything was perfect. The documentation was solid, the parts were all within specifications, and they assembled as designed. Not even a single part was out of spec. !”
Scott L.- Medical Device Mfg.
“We got the parts in yesterday afternoon. I opened the box and checked out a few and they looked GREAT! Thanks for all your help, and please pass along our gratitude to your crew as well! AND … thanks for doing such a nice job on the packaging, too.”
Todd K.- Furniture Mfg.
We have been purchasing shafts for our electric motors from Pioneer Service for decades. Pioneer is one of the best, if not the best, supplier of any product we have ever had. Their consistent quality, aggressive pricing and fast response time is unmatched!
Dave B.- Operations Mgr/Sub-fractional AC Motors
Pioneer Service has been a long time supplier and our plants use millions of Pioneer shafts per year. We have had ZERO quality or delivery issues with Pioneer. Forecasting, in our industry, is very difficult and we know we can always rely on Pioneer to expedite our rush orders!
Mike S.- Commodity Mgr/Electric Motors Mfg.
“Pioneer Service…fast quotes, clear communication, good quality, attractive pricing. One of my best vendors!”
Jay B.- Manufacturing Job Shop