JTF Microscopy Services, LLC is an independent consulting company that in addition to technical consulting on all things glass, also provides training and microscopy laboratory equipment sales and services to customers anywhere in the world.  Clients are primarily glass manufacturers, but there are also raw materials, refractory, furnace repair, and related industries.

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"JT" or J. Terry Fisk, the Sr. Scientist and owner of JTF Microscopy, has forty six years experience as a chemical microscopist specializing in the identification and analysis of defects and contaminants in glass, mineralogy of raw materials used in the glass industry as well as the acid insoluble fraction and heavy mineral separation of raw materials with identification of those fractions, the mineralogy and unique micro-textures of diverse refractory products.  He also has experience in the identification of natural and synthetic fibers, as well as foreign particulate contaminants in a wide range of products, not limited to the glass manufacturing industry.  He is a graduate of the McCrone Research Institute with a MS certification in Chemical Microscopy.

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Terry retired from Corning, Inc. as a Distinguished Associate, specializing in the teaching and application of polarized light microscopy (PLM) and scanning electron microscopy (SEM) with energy dispersive x-ray spectroscopy (EDX/S) in the identification and remediation of glass defects. He has authored several technical papers on “Petrographic Analysis” dealing with the application of PLM to the identification of glass defects and their sources in addition to the analysis/understanding of refractory failure mechanisms. He has presented comprehensive seminars on the petrographic method at the Conference on Glass Problems as well as at many customers' factory locations.

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Terry was a Glass Technologist for three years in Corning's Corporate Division where he assisted the factory technologists adjust compositions to stay within specified properties ranges.