Executive Team

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 over 25 technical papers worldwide and is the inventor or co-inventor of 10 patents. Outside of work, Mr. Mitchell enjoys spending time with his family and golfing.

Ms. Allen has worked in a variety of Accounting and Financial Planning & Analysis roles in her more than 10 years at Particle Measuring Systems, including Senior Accountant, Senior Business Partner, Manager, and Director of FP&A. She holds a BBA in Accounting as well as a BBA in Finance, holds active CPA licenses in multiple states, and prior to her tenure at PMS, she was an auditor for Pricewaterhouse Coopers. In her current position, she enjoys developing business intelligence for corporate key decision-making, cross-functional collaboration, and problem-solving. Outside of work, Ms. Allen enjoys Friday night movie nights with her family, trail cycling, and extended-family summer pool parties.

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 various technical 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.

Mr. Verma has worked for over 20 years at various levels of Engineering and Manufacturing Operations in the Electronics Manufacturing industry. He is experienced in implementing manufacturing strategies and key performance indices to drive business goals. Most recently, Mr. Verma held the position of General Manager of Operations at Fabrinet where he managed global accounts and especially enjoyed leading strategic projects in cross-functional teams. He holds a Bachelor’s degree in Mechanical Engineering and a Master’s degree in Manufacturing Technology. In his free time, Mr. Verma enjoys spending time with his family, playing golf, sudoku, and watching documentaries.

Ms. Nasta joined Particle Measuring Systems in January 2019 as Vice President of Human Resources. Her background in strategic planning, cultural transformation, compensation programs, benefits and rewards, and organizational development spans multiple business sectors, settings, and industries including leadership experience at Wells Fargo, Shell Oil, Noodles & Company, and Rocky Mountain Institute. Ms. Nasta holds Bachelor’s degrees in English and Business and an MBA from the University of South Dakota. Outside of work, Ms. Nasta enjoys staying active with her three kids and dog, trail running, and traveling.

Mr. Wiedmann brings with him a wealth of commercial and general management experience in global sales and business leadership roles across multiple industries. Most recently, he was with Danaher Group where he was Senior Sales Director DACH at Leica Microsystems. Prior to that, he held international sales and general management roles at Thermo Fisher Scientific and worked at Siemens, where he was responsible for business development and in-house consulting. Mr. Wiedmann earned his Executive MBA at WISO University, Nuremberg, and a Master of Science in Electrical Engineering at FAU, Erlangen. In his free time, he enjoys football (both European and American versions), skiing, swimming, and travel.

Mr. Hei started his career in Particle Measuring Systems as China General Manager and gradually extended managerial scope to entire Asia region. William ever experienced multiple functions is his career, including product marketing, solution sales, segment BU head, GM & board member of listed company. William is experienced in managing hybrid sales and service organization for key account management and solution business development. William is a certified trainer of KornFerry / Miller Heiman sales courses for Spectris Group. During his free-time, William enjoys reading, gym, travelling and spending time with his family.

Mr. Kibe joined Particle Measuring Systems in April 2017 and is responsible for the company’s Global Legal, Ethics, and Compliance functions. Mr. Kibe has a Bachelor of Science degree in Environmental Engineering from the United States Military Academy and has his Juris Doctor from the University of Colorado School of Law. Mr. Kibe served in the United States Army and worked in sales prior to law school. He has practiced law for the last 16 years with 3 years being spent at a law firm in Denver and the 10 years prior to joining Particle Measuring Systems supporting two Fortune 250 companies as in-house counsel. When not at work, he enjoys spending time with his family and spending time outdoors.

Mr. Panofen has an established foundation as a well-recognized and successful Leader in the Life Science industry, driving the sterility assurance business. He has wide-ranging experience in applied pharmaceutical microbiology and has been an invited speaker at international conferences including ECA and PDA, with a strong regulatory background in pharmaceuticals. In his career, he successfully covered positions in Sales, Application Support, and regional & product marketing. In his free time, he enjoys spending time in nature skiing, hiking, and biking. Additionally, he supports his handball club as a referee and member of the board.

Mr. Davis joined Particle Measuring Systems in 2015 to lead the global Application Engineering team. In his current position, he is responsible for creating, executing, and improving after-sales support solutions. In addition to his experience at Particle Measuring Systems, Mr. Davis has held product line manager and product development roles in the thin film vacuum process equipment industry. Mr. Davis holds postgraduate degrees in Business and Engineering. Outside work, Mr. Davis enjoys spending time with his family, racing cross-country skiing, and downhill skiing.