Grason-Stadler Founders


In 1949, Rufus Grason and Steven Stadler cofounded Grason-Stadler (GSI). In the early days, the products were instruments for behavioral research. These instruments were used by university psychology departments, the pharmaceutical industry for drug research, and by NASA Project Mercury for training Ham and Able, the first space chimps. Since the release of its first commercially available audiometer in 1952, GSI has been manufacturing electronic medical instruments which are used for research and clinical measurement in the field of hearing.

  • 1950’s

    Speech Audiometer

    The 162 and E-800 were the two audiometers recognized as the best money could buy. They were in production from 1956 to 1970 and were built to last. It was not uncommon to see overhauled and re-conditioned instruments that were 15 to 20 years old and still being used. 

    Speech Audiometer
  • 1960’s

    Programming System Opens Doors

    The Series 1200 System was Grason-Stadler's response to those researchers who needed sophisticated control of experiment parameters and versatile data acquisition techniques. It was smaller, quieter, and much faster than its relay counterpart.

    Grason-Stadler Series 1200 System
  • 1970’s

    The Game Changer, GSI Pure Tone and Speech Audiometer

    The 1701 audiometer was Grason-Stadler's game-changing instrument. It represented a significant step forward from all others. It was simplicity but with ultimate sophistication in performance, extremely user-friendly and reliable.

    Pure Tone Speech Audiometer
  • 1980's

    The next generation of clinical audiometry

    In 1981, GSI introduce a microprocessor-based audiometer, the GSI 10. This audiometer has shaped the way audiologists perform testing today. The GSI 10 included comprehensive manual audiometry with an option for automated Bekesy audiometry.

    GSI 10 Clinical Audiometer
  • 1990's

    GSI 17 provides basic audiometric capabilities

    The GSI 17 audiometer is a single-channel, pure tone, air conduction, portable instrument designed to provide basic audiometric capabilities for physicians’ offices, schools and industry. It was a compact and lightweight device easy for transportation of a variety of testing environments.

  • 2000's

    GSI TympStar provides middle-ear testing solutions

    Comprehensive testing made easy. GSI releases a comprehensive middle-ear testing solution that offers hearing professionals with versatility, flexibility and functionality. Two versions allow clinicians to find the best fit for their testing environments.

    GSI Tympanometer
  • 2009

    Grason-Stadler has a New Identity

    In October 2009, Grason-Stadler relocated their headquarters to Eden Prairie, MN, broadening their global presence in clinical audiometric solutions. GSI’s motto of “Setting the Clinical Standard” established the driving mindset in every aspect of the business.

    Grason-Stadler Logo
  • 2010

    GSI becomes EMR/EHR compatible

    GSI Suite is introduced, providing an audiometric data management solution to GSI products. Suite allows for quick and accurate capturing, saving and sharing of patient information.

    Tympanometry Results
  • 2012

    Clinical Two Channel Audiometer

    The GSI AudioStar Pro replaced the industry powerhouse GSI 61. The AudioStar Pro brings the same ergonomic design and one button functionality as its predecessor did.

    AudioStar Pro Clinical Audiometer
  • 2013

    Diagnostic and Screening OAE

    The GSI Corti offers a complete solution for OAE testing. Easy in operation and speed make it ideal for all environments.

    Corti Otoacoustic Emissions
  • 2015

    Clinical Middle Ear Analyzer

    The TympStar Pro replaces the solid, long running TympStar. TympStar Pro provides all of the desired functionality of it's predecessor plus offers modern functionality.

    TympStar Pro Clinical Middle-Ear Analyzer
  • 2016

    Adaptable Mid-Level Audiometer

    The GSI Pello is the newest addition to the GSI line, offering a solution to the market that can be customized with the clinician's needs.

    Pello Diagnostic Audiometer