John Mitchell
CEO & President

Starting as a research and development scientist when he joined Particle Measuring Systems in 1995, Mr. Mitchell discovered that he enjoyed working with customers to solve their problems.  As a result, he became more involved in the commercial aspects of the business. After holding positions at the company in various other capacities, Mr. Mitchell was appointed president of Particle Measuring Systems. He has written and presented more than 25 technical papers around the world and is the inventor or co-inventor on 10 patents. Outside of work, Mr. Mitchell enjoys spending time with his family and golfing. 


Brian Knollenberg
Electronics Division
Vice President & General Manager

Mr. Knollenberg provides performance-leading solutions to the microelectronics, display and industrial sectors. In his more than 15 years at Particle Measuring Systems, Mr. Knollenberg has held a variety of technology and leadership roles in product development, global applications and general management. In addition to his experience at Particle Measuring Systems, Mr. Knollenberg has held marketing and business leadership positions in the thin film vacuum process equipment industry. Mr. Knollenberg is actively involved in several nonprofit organizations. Prior to his professional career, he served with the United States Army. When not at work, he spends time in the mountains hiking, fishing and spending time with family.


Anna_Campanella-(1).jpgAnna Campanella, Ph.D
Life Sciences Division
Sterility Assurance & GMP Specialist

Anna Campanella is an expert in pharmaceutical microbiology and sterility assurance. Her experience in the pharmaceutical field started in 2007 in a biotech company, that produces cell therapy products, as a chemical and microbiological analyst and then as a quality control supervisor. From 2013 to 2016 she worked in a traditional pharmaceutical company, that produces sterile bulk antibiotics, as a Quality Control and Quality Assurance Manager. During these years, she received a PhD in Molecular Medicine and she also improved her knowledge about QA&QC processes, validation of chemical and microbiological methods, validation of sterile production processes and above all she gained the experience about microbiological aspects during aseptic production processes. Today Anna is the Global sterility assurance e GMP specialist for Particle Measuring Systems. In this role, she collaborates and consults with pharmaceutical companies to develop and implement science-based strategies, principles to monitor, control and improve the chemical, physical, and microbiological state of various production processes.


Dan-Rodier.jpgDan Rodier, Ph.D.
Electronics Division
Technology Development Manager

Dr. Rodier has a Ph.D. in analytical chemistry from the University of Colorado and has over 23 years of experience developing and implementing technologies and strategies to measure airborne molecular species and particulate contamination. Dr. Rodier has four patents for microcontamination monitoring technologies. He has worked with customers across Asia, Europe and North America to implement monitoring programs in the semiconductor, aerospace, hard disk drive and flat panel display industries.


Dwight-Beal.jpgDwight Beal
Electronics Division
Senior Applications Engineer

Mr. Beal previously worked as a manufacturing technician for a company making ultrasonic breast scanners that detected cysts. After many years with Particle Measuring Systems, he focuses on helping customers overcome their most difficult particle monitoring challenges and finding ways to meet their requirements. Mr. Beal pursues additional passions like sailing and scuba diving in oceans around the world.


Isidro Sanchez
Electronics Division
Applications Engineer

Mr. Sanchez is a Colorado native who prior to joining PMS in 2015, worked at Intel Corporation for 10 years.  The majority of his experience at Intel came within the Fab’s Yield Department as a Microcontamination Engineer and Metrology Tool owner, additionally he worked as a Capacity Planning Industrial Engineer at Intel’s Substrates Packaging Test and Development Site start up.  Mr. Sanchez earned his Bachelors of Science degree in Chemical Engineering at the University of Colorado at Boulder, a Master of Science Degree in Industrial Engineering as well as a Master of Business Administration Degree at Arizona State University.  In his free time Isidro enjoys spending time learning from his son, going on outdoor adventures, cross training, reading, and exploring practical philosophies.


John-Daivis.jpgJohn Davis
Electronics Division
Global Applications Engineering Manager

Mr. Davis leads a global team of applications engineers to help our customers integrate PMS systems into their processes to solve their various applications needs. Mr. Davis comes to Particle Measuring Systems with a background in thin film processing for the storage, display and optics industries.    



Kieth-Dillenbeck.jpgKeith Dillenbeck
Electronics Division
Product Line Manager, Liquid and airborne molecular contamination (AMC)

Up until working at Particle Measuring Systems, Mr. Dillenbeck has worked in the semiconductor process industry for over 25 years for several semiconductor capital equipment and process system suppliers. Some of his industry expertise from working at Kinetics Process Systems, Air Liquide Electronics and Ashland Chemical Company. While at PMS, Mr. Dillenbeck places a lot of emphasis on direct customer interactions and determining their product needs. When not working, Keith and his wife enjoy gourmet cooking, beer brewing and camping.

Paul-Hartigan.jpgPaul Hartigan
Global Product Line Manager Systems and Software

Paul Hartigan has been involved in product management, engineering development and marketing for over 25 years.  He has held a variety of product management positions covering most PMS products over his last 8 years with PMS. His background includes work for a variety of instrumentation companies serving pharmaceutical, oil and gas industry, industrial manufacturing, utilities, and municipal water industries.  He has a Bachelor’s Degree in Electrical Engineering Technology as well as a MBA in Marketing.  He has published numerous application papers as well as presenting at seminars around the world.   


Rebecca-Thompson.jpgRebecca Thompson
Electronics Division
Product Line Manager, Aerosol and Gas

Mrs. Thompson joined Particle Measuring Systems after working for Air Liquide as a project specialist for bulk industrial gas systems. A long-standing team member at PMS, she continues to enjoy challenges of customers and ways PMS can help overcome these. When not at PMS, Mrs. Thompson wrangles with three active and growing boys. She also enjoys to read, even if most books lately use fewer words and more pictures. 


Steve-Kochevar.jpgSteve Kochevar
Electronics Division
Senior Global Applications Engineer

Prior to coming to Particle Measuring Systems, Mr. Kochevar worked as a seismographic engineer in the oil exploration industry and also designed hardware and firmware for the video gaming industry. Some of his contributions while at PMS include working with customers’ diverse applications and determining how to integrate PMS systems into their processes. Outside of work, Mr. Kochevar spends time with loved ones, practices photography and plays with his dog, Fritz Von Fangenstein. 


DCrance-(1).jpgDavid Crance
Life Sciences Division
Sales Manager

David Crance is the Life Sciences Sales Manager for Particle Measuring Systems and has been in the Life Sciences business for over 30 years. He has lectured for pharmaceutical societies and organizations throughout the USA and Asia on environmental monitoring systems and their cGMP regulations. He has been an Instructor at the Parenteral Drug Association (PDA) headquarters in Bethesda, Maryland for twelve years. David has been involved in the design and implementation of almost 500 environmental monitoring systems. In his role as Life Sciences Sales Manager, he works with leading engineering firms and manufacturers in the designing of Environmental monitoring systems.


norwich-2014-0618-0456-2.jpgEric Gottlieb
Life Sciences Division
Americas Business Manager

Eric Gottlieb has been working with pharmaceutical and medical device manufacturing companies for over 14 years, specializing in monitoring systems, quality assurance and validation.  Currently Americas Business Manager for Particle Measuring Systems Life Sciences Division, he has played an active part in the GMP-compliant design and implementation of dozens of environmental monitoring systems from risk assessment through system validation.