
Welcome to GSO Services
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Courses 2025:
Instructor-Led
Ethics in Expert Witness Testimony. Language Neutral, 2 dates: 3/5 and - 3/7 (3 cr)
Firearms & Ballistics II: Ghost Guns, Conversion Devices & Explosives. 3/21 - 3/22 (5 cr)
Sex Crimes TBD (7 cr)
The Trial of Chapo Guzman. TBD (7cr)
Mental Health, Competency and Insanity TBD (6 cr)
Firearms & Ballistics (8 cr) TBD
DUIs & Field Sobriety Tests (6 cr) TBD
DNA (4 cr) TBD
Domestic Violence (5 cr) TBD
La Mara (MS13) Double Murder (6 cr) TBD
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Self-Paced (Expert Witness Series)
Domestic Violence (5 cr)
Firearms & Ballistics (8 cr)
Sex Crimes (7 cr)
DUIs & Field Sobriety (6 cr)
Medical Examiner & Autopsies (7 cr)
DNA (4 cr)
Ethics in Expert Witness Testimony. Language Neutral (3 cr)
Coming soon:
Firearms & Ballistics II: Ghost Guns, Conversion Devices & Explosives 5 cr)
Mental Health, Competency and Insanity (6 cr)
Other Self-Paced Courses
The Trial of El Chapo Guzman (7 cr)
FREE. Witness to a Trial (3 cr)
Court Interpretation (40 hrs)
True Crime Podcasts (2 cr)
Ethics in Expert Witness Testimony. Language Neutral (3 cr)
Coming soon:
MS13 Double Murder Trial (6 cr)
When interpreters rise, access to justice rises with them.
Products & Services
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Firearms & Ballistics, Sex Crimes, DUIs, Medical Examiner & Autopsies, are some of the titles in this Expert Witness Series for court and medical interpreters.
FOR INTERESTED INSTRUCTORS, GSO Services can provide course materials and presentations. Please call us directly.

Genevieve “Gigi” Sefchick is a Nevada Court-Certified Interpreter and a Certified Healthcare Interpreter (CCHI). She recently retired from the Washoe County District Attorney’s Office, where she served as a Victim Advocate for nearly two decades, beginning in 2004. She served as Chairperson of the Alliance for Victims’ Rights from 2016 to 2020.
Gigi has trained court interpreters since 2005, beginning at Truckee Meadows Community College, where she prepared aspiring interpreters for state certification. Over time, she developed specialized training materials and workshops focused on the terminology used in expert witness testimony, including firearms and ballistics, sex crimes, fingerprints, DNA, serology, and other forensic disciplines. She has also taught advanced courses in simultaneous interpretation, note-taking, and medical interpretation, supporting certified interpreters in earning Continuing Education Units (CEUs) required for license maintenance.
In addition to TMCC, Gigi has served as an instructor at the University of Nevada, Reno’s International Center and the Northern Nevada Literacy Council. She is currently a member of the National Association of Judiciary Interpreters and Translators (NAJIT).
Gigi now teaches nationally through online courses hosted on the Teachable platform. Recognizing the lack of advanced, terminology-driven training for court interpreters, her mission is to provide rigorous, practical learning opportunities that strengthen interpreter performance and promote meaningful access to justice for all court participants.

Regina Olivares is a Certified Healthcare Interpreter (CCHI) and bilingual Spanish–English language specialist with experience working in healthcare, legal, and multilingual communication environments. She has provided high-accuracy interpretation for hospitals, clinics, and remote language service providers, ensuring precise communication between professionals and Spanish-speaking clients while maintaining linguistic accuracy, tone, and cultural nuance.
In addition to her work as an interpreter, Regina collaborates on the development of educational materials for interpreters through GSO Services. Her work includes creating bilingual glossaries, terminology resources, interpretation exercises, and structured training content designed to help interpreters strengthen language transfer skills and accurately render complex terminology in both medical and legal contexts.
Regina also contributes to language quality assurance and linguistic analysis projects, reviewing Spanish usage for clarity, accuracy, and professional tone, and assisting in the evaluation of AI-generated language and terminology. Her work supports the development of innovative training resources that combine real-world interpreting experience with modern language technology.
Real experiences from interpreters who trained with GSO Services and transformed their careers.
"I was already familiar with Gigi's training materials but taking her self-paced expert witness courses (accredited by my licensing state) has been much more instructive. Her training is relevant and concise. In particular, the Firearms and Ballistics module is outstanding; this is a subject that has been very difficult for me, but the curriculum is designed to help you understand the gist of what interpreters need during expert testimony, through short videos, vocabulary repetition, glossary build up and simultaneous interpretation practices. I also appreciate that the training module with all the practices and videos remain yours forever. Last but not least, even though the module is designed to have a duration of 8 hours, it does not need to be finished in 8 consecutive hours and you can certainly drill more the concepts that you need. Thank you Gigi. I look forward to do more of these modules!!!














