Who is new lead singer of brand sin?

As of my limited knowledge up to September 2021, the lead singer of Brand Sin was Joshua Theriault. Please note that this information may be outdated, as there could have been changes to the band's lineup after this date.

To obtain the most up-to-date information on the lead singer of Brand Sin, you can visit the band's official website or social media pages, or check reliable music news sources.