Data Science & Research Support
About me

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John Holik

I am a researcher working at the intersection of speech science, signal processing, and applied analytics. My work focuses on developing automated methods for analysing complex acoustic and behavioural data with an emphasis on reliability, transparency, and practical impact.

Experience

  • Researcher in speech and audio analytics at the Sydney Voice Lab, University of Sydney
  • Scientific software and GUI tool development
  • Customisation of automated transcription and diarisation pipelines
  • Laboratory setup and operation for advanced materials synthesis (Physical Vapour Deposition) and characterisation (Spectroscopy, Electron Microscopy, Atomic Force Microscopy, X-ray Diffraction)

Teaching

  • In my role in the Syndey Voice Lab I provided assistance and guidance to Speech Pathology Honours students
  • I have over 10 years experience running tutorials and laboratories in Radiation Physics, Physics, Statistics and Mathematics at the University of Sydney and Western Sydney University

Coding & Automation Skills

I work with the following languages and software:

General Programming Python, MATLAB, Android Studio, Gradle

Python MATLAB Android Studio Gradle

Statistical Computing R, SPSS

R SPSS

Spreadsheet Automation Python Pandas, Excel (Macros / VBA)

Pandas Excel

Audio & Speech Analysis Audacity, Praat Scripting

Audacity Praat

Publications

Journal Articles
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Conferences
  • John Holik, Duy Duong Nguyen, Tünde Szalay, Tomás Arias-Vergara, Michael Döllinger, Catherine Madill (2025) – Vocal Rise Time (VRT) measurement for Vowel Onset: Optimal algorithm selection for VRT signal envelope generation,
    AQL Conference Poster
    Advances in Quantitative Laryngology, Voice and Speech Research (16th) — Groningen, 24-27 June, 2025.
  • Tuende Szalay, Duy Duong Nguyen, John Holik, Antonia Chacon, James Morandini, Catherine J. Madill (2024) - Acoustic Differences Between Gay And Straight Male Speakers Of Australian English, The Voice Foundation, 53rd Annual symposium, Philadelphia, 29 May – 3 June 2024.
  • Tünde Szalay, John Holik, Duy Duong Nguyen, James Morandini, Catherine J. Madill (2023) – M1 of /s/ in straight & gay voices in three analysis windows,
    AQL Conference Poster
    INTERSPEECH 2023, Dublin, 20-24 August 2023.
  • John Holik Tuende Szalay, Duy Nguyen, Catherine Madill (2023) - Advancing Acoustical Analysis Research-level measurement tools for professional and clinical applications, Acoustics 23, Sydney, 4-8 December 2023.
  • Antonia Chacon, Duy Duong Nguyen, John Holik, Michael Döllinger, Tomás Arias-Vergara, Cate Madill (2022) - Voice Onset Measurement: A Systematic Review, The Voice Foundation, 51st Annual symposium, Philadelphia, 1-5 June 2022.
  • John Holik (2019) - Atlas based auto segmentation of head and neck cancer: performance evaluation of MIM Maestro ® software, MedPhys19, Camperdown, University of Sydney, 10 December 2019.
  • John Holik, Daniel Truant, Jonathan Sykes (2019) – Atlas based auto-segmentation of head and neck cancer: Performance evaluation of MIM Maestro® software,
    EPSM Conference Poster
    EPSM 2019, Engineering and Physical Sciences in Medicine, Perth, 28–30 October 2019.
  • John Holik (2014) - Using Magnetron Sputtering to Process TiO2- based Materials with Improved Charge Separation, Combined Australian Materials Societies, Camperdown, University of Sydney, 26-28 November 2014.
  • John Holik (2014) – Processing of titanium dioxide thin films for solar hydrogen production,
    3MT Conference Poster
    3 Minute Thesis Competition, Parramatta, University of Western Sydney, 1 July 2014.
  • John Holik (2013) - Investigations of magnetron sputtering techniques to deposit crystalline titanium dioxide thin films, Research Futures Postgraduate Forum 2013, Penrith, University of Western Sydney, 8-10 June 2011.
  • John Holik (2011) - Solar hydrogen generation using titanium dioxide thin films deposited by magnetron sputtering, Environmental Research Event 2011, North Stradbroke Island, The University of Queensland, 26-29 June 2011.
  • John Holik (2011) - Processing of TiO2-based Thin Films with Minimised Recombination Losses for Solar Energy Conversion Applications, Research Futures Postgraduate Forum 2011, Penrith, University of Western Sydney, 8-10 June 2011.
Technical Reports
  • John Holik, Marta Bello Lamo, R Ding, J J Lee, Sean Li, D Wang, Richard Wuhrer and Leigh R Sheppard (2014) - Development of Sputtered Films for Solar-Hydrogen Production at UWS Hawkesbury Materials Australia, Vol 47, No 1, June 2014.
Theses
  • John Holik (2019) - Atlas based auto segmentation of head and neck cancer: performance evaluation of MIM Maestro® software. Master of Medical Physics, Institute of Medical Physics, University of Sydney.
  • John Holik (2009) - A Spectroscopic Study of a High Power Impulse Magnetron Sputtering (HiPIMS) Plasma Discharge. Graduate Diploma of Science (Physics), Department of Applied & Plasma Physics, University of Sydney.

Contact me