張晉堂係香港警察嘅一份子。

據讀者資料，佢係2011年大學畢業之後旋即多次投考加入香港警察督察級成員，2013年受訓，2014年8月成為正式成員，現時有份搜刮示威者資料。

係2019年6月多場示威後，佢曾經係Facebook發表以下貼文：

When I get home people 'll ask me, "Hey Hoot, why do ya do it man? Why? Just some war junkie?" Ya know what I'll say? I won't say a goddamn word. Why? They won't understand. They won't understand why we do it. They won't understand that it's about the men next to you, and that's it. That's all it is. (Black Hawk Down [2001])