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Presenters

Our Restek presenters have been chosen from across our organization for their in-depth knowledge, extensive experience, and innate ability to present complex material clearly and effectively. You will also find many of our presenters on ChromaBLOGraphy at blog.restek.com


Jonathan Keim

Jonathan Keim

Jonathan "Munch" Keim found his initial home at Restek in technical service, where he spent eight years putting his BS in chemistry from Juniata College and MS in analytical chemistry from the University of Pittsburgh to work assisting Restek's customers. He started as a technical service specialist and ultimately rose to technical service manager before assuming the role of sample preparation product marketing manager. Since 2012, Jonathan has been supporting and expanding the company’s technical training program as education program manager. Along with providing instruction on QuEChERS and other sample prep methods, Jonathan also lends his expertise to our GC and GC-MS seminars.
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Scott Adams

Scott Adams

Equipped with a BS from The Pennsylvania State University and two years' experience as an environmental chemist at Lancaster Labs, Scott spent 13 years with Alltech Associates/WR Grace, where he worked in research & development, technical support, applications, product management, and e-business. Most recently before joining Restek, he also worked at Thermo Scientific as an applications specialist. Currently, Scott is Restek's GC business manager.
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Barry Burger

Barry Burger

Restek's senior petrochemical innovations chemist has more than 30 years of chromatography experience and has been a voting member of the ASTM D2 committee for over a decade. Barry specializes in petrochemical applications.
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Frances Carroll

Frances Carroll

Frances earned a BS in biochemistry and molecular biology, a minor in chemistry, and an MS in forensic science from The Pennsylvania State University. She is currently the business development manager for Life and Health Sciences at Restek. Prior to taking on a business development role, Frances was an R&D manager for LC applications and an LC applications chemist. Frances focuses on method development, troubleshooting LC and LC-MS/MS applications, and using new and existing products in an effort to provide better solutions to our customers. Before joining Restek, she worked as a research chemist and, later, as a group leader for a contract research organization focusing on regulated high-throughput bioanalytical research performed by LC-MS/MS. Frances has also taught analytical chemistry courses, including quantitative analysis, forensic chemistry, chromatography, and spectroscopy at her alma mater, Penn State, and continues to receive opportunities to return as a guest lecturer.
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Paul Connolly

Paul Connolly

Paul brought 24 years of analytical and chromatography expertise to Restek, including 16 years performing LC-MS/MS. He earned his BS in biology and a minor in chemistry from the University of Pittsburgh, after which he was an environmental GC, GC-MS, and HPLC chemist for nearly a decade. Paul has also worked as a scientist and was principle investigator, group leader, technical leader, and method developer for a contract research organization providing LC-MS/MS support to the food safety, environmental, animal health, and crop protection industries. Paul was also a bioanalytical laboratory director, providing analytical laboratory services for drug development. As our liquid chromatography business manager, Paul's main focus is to grow and develop Restek's LC product lines and to provide our customers with high-performing solutions to their LC challenges.
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Jaap de Zeeuw

Jaap de Zeeuw

Jaap is a world-renowned chromatographer with over 40 years of experience, including 27 years with Varian/Chrompack focusing on industrial analysis challenges. For his 1979 graduation from The Institute for Higher Education, specialized in chemistry, Jaap authored a paper titled "The Challenge of Coating Flexible Fused Silica Capillary Columns" and has since distinguished himself as an authority on the subject. Directly involved with the creation of numerous chemically bonded columns, including the first bonded PEG column and the stabilized PLOT columns widely used in the petrochemical arena, Restek’s international GC specialist has helped develop new techniques, such as fast GC-MS using vacuum GC technology, and has filed two patents for his work. Based out of the Netherlands, Jaap celebrates 10 years with Restek. Jaap is extensively published and regularly travels internationally to share his knowledge.
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Chris English

Chris English

Since 2004, Chris has managed a team of chemists in Restek's innovations laboratory who perform new product testing, method development, and applications work. Before taking the reins of our lab, he spent seven years as an environmental chemist and was critical to the development of Restek’s current line of volatile GC columns. Prior to joining Restek, he operated a variety of gas chromatographic detectors conducting method development and sample analysis. Chris holds a BS in environmental science from Saint Michael's College.
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Robert Freeman

Rob Freeman returned to Restek in December 2012 as the LC business development manager. In 2015, he became the OEM business development manager, and currently, he is Restek's director of business development. Rob came from SGE Analytical Science where he was the chromatography business manager responsible for the commercial facets of the chromatography products portfolio in North and South America. Prior to SGE, he was an applications chemist here at Restek, providing methods and development support. Rob has over 23 years of chromatography experience; he has developed numerous GC and LC applications that focus on achieving critical separations and optimizing current methodologies. Rob holds a BA in biology from The University of Texas at Austin.
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Ashlee Gerardi

Ashlee Gerardi

Ashlee Gerardi is Restek’s business development manager for our cannabis market. She joined Restek in 2011 as a QA technician after earning her bachelor’s degree from Lock Haven University in chemistry. In 2013, she transferred to Restek West as an R&D chemist working on novel stationary phases and surface deactivations; however, the demand for an additional business development manager was soon needed for the growing cannabis industry. Already pursing an MBA at Plymouth State University, Ashlee saw an opportunity to use her technical background and new business knowledge to help Restek enter the cannabis industry. In 2017, she transferred back to Restek Bellefonte as an associate business manager in the cannabis market, and in 2018, she was promoted to business development manager.
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Scott Grossman

Scott Grossman

Scott Grossman has worked at Restek for over 10 years. Scott was an innovations chemist for six years before serving as technical supervisor of the Quality Control Department for four years. Currently, Scott is the content development specialist in the Strategic Marketing and Communications Department. Scott is interested in GC injection techniques and liner choice in particular. Before he arrived at Restek, Scott earned a BS in chemistry from the University of Mary Washington and then spent six years with the U.S. Army researching chemical sensing and the detection of explosives. His experience is predominately in gas chromatography and mass spectrometry.
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Jason Herrington

Jason S. Herrington, PhD

Jason joined Restek in 2011 after spending over 10 years in environmental analysis, most notably as a postdoctoral research fellow with the U.S. EPA focusing on the development of techniques for organic speciation of ambient gas-phase and particulate air toxics. He has a BS in environmental sciences from Rutgers University and a PhD in exposure science from The University of Medicine and Dentistry of New Jersey. His wide-ranging work has been published in over a dozen peer-reviewed manuscripts and presented around the world. As a senior scientist with Restek, Jason is heavily involved with developing new air products and applications.
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Ty Kahler

Ty Kahler

Ty joined Restek as a senior innovations chemist in 2008 and has since become the senior manager of the LC Solutions Group, which includes all aspects of R&D and applications as well as LC-related sample preparation. In addition to overseeing the LC lab, his responsibilities include LC methods development; quality implementation and investigation, and phase design/research. Prior to joining Restek, Ty worked as a manager, study director, and principal investigator for a contract research laboratory and pharmaceutical company conducting methods development, validation, and routine analysis of pharmaceuticals and agrochemicals. He has been in the field of liquid chromatography for almost 20 years, including time as a quality control chemist and instrumentation metrologist.
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Joe Konschnik

Joe Konschnik

In his role as Restek’s business development manager for the global food and agriculture market, Joe applies his 36 years of analytical chemistry experience toward observing market needs, overseeing technical content development for new applications, and identifying new technologies and product opportunities. After receiving his BS in public/environmental health, Joe spent the next 19 years of his career working for some of the nation’s largest environmental testing laboratory companies. As an analytical chemist, he performed methods for analysis of organic and inorganic contaminants in water, soil, and air matrices and gained experience in sample collection, preparation, and analysis. Joe has been an employee-owner with Restek for nearly 18 years and has been an invited speaker on sampling and analytical chemistry topics globally. Joe serves in volunteer leadership roles for several industry-related organizations: he is board chair of the Independent Laboratories Institute (ILI); an executive committee member of the food sciences section of the American Council of Independent Labs (ACIL); and past chair of the sampling and laboratory analysis committee (SLAC) of the American Industrial Hygiene Association (AIHA). Joe is also an active member of AOAC International, NACRW, and AOCS.
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Rick Lake

Rick Lake

Rick is the vice president of marketing at the Restek Corporation, overseeing the development and execution of the corporate marketing strategy. Prior to this, Rick was director of business development, managing the coordination of market research and the development of applications and industry collaborations. Other previous roles that Rick has held at Restek include business unit manager and product line manager for liquid chromatography, where he was tasked with leading the development of LC products and strategy. In addition, Rick served as a pharmaceutical market development manager and pharmaceutical innovations chemist, developing GC and LC applications and assisting in new product development. Before joining Restek in 2005, he worked for seven years as a study director and principal investigator for a contract research lab, developing and validating cGXP compliant GC and LC methods while also managing the Stability Testing Department. Prior to shifting his focus to pharmaceuticals, Rick spent four years performing pesticide residue and volatile/semivolatile analyses.
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Katarina Oden

Katarina Oden

Katarina came to Restek with a BS in chemistry from the University of Ljubljana, Slovenia, and research experience in both commercial and university labs. After three years as a QA analyst, she joined the Innovations Department, where her work focuses on supporting new product development and applications for the petrochemical market. Katarina is also a member of ASTM D2 and D3 committee.
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Jan Pijpelink

Jan Pijpelink

Jan is a 39-year veteran of the petrochemical industry with extensive international experience in petro laboratories and with process applications throughout North America, Europe, and Asia. In his current position of technical business development manager for energy and chemicals, Jan leads our scientific collaborations and key industry partnerships. Jan also serves as chair of ASTM Section D02.D0.03 (C3 hydrocarbons), and as vice chair of D02.04.0H (SimDist).
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Chris Rattray

Chris Rattray

Chris is a senior scientist in GC Solutions with a BS in chemistry from the University of California, Riverside, and almost 15 years’ experience in environmental analysis. Prior to joining Restek, Chris worked at multiple environmental testing laboratories in Southern California in the positions of organic analyst, organic supervisor, technical director, and laboratory director. Chris’s responsibilities at Restek are split between the optimization of existing environmental methods and the development of new GC columns and GC accessories.
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Randy Romesberg

Randy Romesberg

Randy is a senior scientist who has been immersed in the design, manufacture, and use of LC columns for over 30 years. After working at Keystone Scientific, Inc., as both a chemist and research/applications supervisor, he came to Restek in 1994 to help establish Restek’s LC column product line. Ever since, he has been developing a steady stream of innovative new stationary phases, silica particles, and column hardware, such as the Biphenyl stationary phase, Pinnacle II silica and Trident guard system. Randy holds a BS in science from Penn State University and has collaborated with other organizations such as The Ohio State University and the National Institute of Science and Technology.
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Kristi Sellers

Kristi Sellers

With over 30 years of experience in chromatography, Kristi has worked for Restek as an applications chemist with experience in both GC and LC method development. She has also worked as a QC chemist and a process chemist in addition to her managerial positions in GC Column manufacturing, QC, the Applied Science Group, and R&D. Kristi is currently a senior product marketing manager for GC columns. She holds a BS in chemistry from Lock Haven University, an MBA from Regis University, and has been a Restek seminar instructor for more than three decades.
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Gary Stidsen

Gary Stidsen

Gary has over 30 years of experience in chromatography, including sample preparation techniques, air sampling, and chromatographic analysis. He specializes in gas chromatography with an emphasis on the environmental and petroleum markets. Gary has been at Restek for almost 20 years and has played an instrumental role in developing many key products and numerous applications. During this time, he has served as the innovations lab manager, product manager for both the GC Column and air sampling lines, and director of research and innovation, where he was responsible for all aspects of research and new product development. Gary is currently our business manager overseeing reference standards, air sampling, and sample preparation.
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Jason Thomas

Jason Thomas

Jason first came to "Chromatography Valley," the location of Restek's state-of-the-art manufacturing and development facility, as a student of chemistry at The Pennsylvania State University. Upon graduation, he ventured into the environmental and chemical industries for four years before finding a home at Restek, where he has been involved in GC column development, environmental applications, and most recently, SPE new product development, over the course of the last 15 years.
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Becky Wittrig

Becky Wittrig, PhD

Becky is Restek's vice president of sales and is responsible for sales and distribution activities in this region. She has over 25 years of experience in chromatography, including GC and LC method development in the areas of food composition and food safety, environmental contaminants, and toxicology. She served previously as the European sales manager, Restek’s global LC specialist (2003–2009) and as a food & flavors applications chemist (2001–2003). Becky also spent two years as the food & environmental business development manager at AB SCIEX before rejoining Restek in 2011. Prior to moving from the Twin Cities to the Happy Valley, she supervised the chromatography laboratories at the Pillsbury Company and Ecolab, Inc., both in St. Paul, Minnesota. In addition to her BA in chemistry from Gustavus Adolphus College (St. Peter, Minnesota), Becky holds a PhD in analytical chemistry from Purdue University and an MBA from the Krannert School of Business at Purdue.
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