One of the foremost scholars of the pre-Islamic languages and inscriptions of the Arabian Peninsula is Dr. Ahmad al-Jallad. Here is a Youtube video of a lecture he gave at Princeton University in 2019. I attended the lecture, along with the South Arabic scholar Christian Robin. For a talk now online of a lecture he gave in Kuwait the same year, click here. Al-Jallad edited the journal Arabian Epigraphic Notes while he was at Leiden University. To follow Dr. al-Jallad’s work on Safaitic, check out the Facebook site.