Claudia López, Ph.D.


Claudia López Ph.D., director of the Multiscale Microscopy Core and research associate professor in the Biomedical Engineering Department, operationally oversees the Multiscale Microscopy Core. Dr. López has extensive experience with electron microscopy research including Transmission Electron Microscopy, Scanning Electron Microscopy, Dual-Beam applications and Serial Block Face Imaging. Her formal training is in biochemistry, biophysics and molecular biology and she has worked in the biochemistry-biophysics and microbiology fields for the past 22 years. Her expertise includes the analysis of both biological (cells, viruses, bacteria, particles and tissues) and non-biological materials (hard materials and fabrics) by TEM, SEM and FIB-SEM and she has routinely performed sample preparation (conventional and cryo-processing), electron microscopy imaging and image analysis. As part of her research interests Dr. López is developing correlative light and electron microscopy techniques for cultured cells and tissues, both for 2D and 3D electron microscopy.  Dr. López is responsible for all day-to-day operations in the Multiscale Microscopy Core, including instrument maintenance and overseeing Multiscale Microscopy Core personnel; meeting with investigators to advise, plan and schedule new experiments; providing sample preparation and imaging services; training users; distributing data; explaining results, and billing for services.

Jessica Riesterer, Ph.D.


Jessica Riesterer, Ph.D. works as a staff scientist in the Multiscale Microscopy Core. Her expertise is in scanning electron and focused ion beam microscopy, concentrating on 3D-data acquisition of life and materials sciences applications. She is also interested in CLEM applications. As a materials scientist by trade, Dr. Riesterer brings a unique perspective to life science imaging, and has experience working with biological tissue/cells, glass and ceramics, metals, semiconductors, polymers, and nuclear fuel and storage materials. She also works with the Teneo VolumeScope serial block face imaging tool and brings her former experience developing the technique as a Senior Applications Engineer at FEI Company to the Multiscale Microscopy Core. In addition to working in the Multiscale Microscopy Core, Dr. Riesterer works in the OHSU Center for Spatial Systems Biomedicine as part of the Gray Lab. Her research concentrates on studying several forms of cancer in 3-dimensions to find a phenotype-genotype linkage.

Erin Stempinski, M.S.


Erin Stempinski, M.S. is a research associate at the Multiscale Microscopy Core.  She is experienced in conventional transmission and scanning electron microscopy, focused ion beam scanning electron microscopy, negative staining, gold immunolabeling of cryosections (Tokuyasu), and correlative light and electron microscopy methods.  Erin has a background in botany and moved from working with plants to animals as an electron microscopy technician at the National Institutes of Health. She is responsible for sample preparation and imaging, training users, general lab maintenance and upkeep, and establishing new techniques.  In addition to working in the Multiscale Microscopy Core, Erin supports research at the OHSU Center for Spatial Systems Biomedicine as part of the Gray lab.

Steven Adamou

Steven Adamou_June 2020

Steven Adamou is a research technician at the Multiscale Microscopy Core. He trains and assists users with use of the Tecnai transmission electron microscope as well as the Helios dual beam microscope. Steven also utilizes wet bench techniques to prepare biological specimens for study via electron microscopy. Steven graduated in 2015 from Lewis & Clark College with a degree in chemistry. After an internship at ThermoFischer Scientific, Steven spent the subsequent four years working in the technology industry where he utilized many of the electron microscopy techniques he learned at ThermoFischer to solve material science problems. While working through coursework in biology at Portland State, Steven discovered that using electron microscopy to study structural biology merged both his technical microscopy skills with his interest in biological systems. In addition to working in the Multiscale Microscopy Core, Steven also supports research at the OHSU Center for Spatial Systems Biomedicine as part of the Gray lab.