I left teaching after my second in department treated me like I didn't exist, undermined me and told lies to other colleagues and drove me to the edge of madness! He even lied to HR when I raised a grievance. I had enough and went quietly to save my sanity. Senior team were not supportive and I was left feeling like the one in the wrong. 6 months later and Im in a better place - HOWEVER - I have recently discovered that prior to me appointing him, he had faced the sack from his middle leadership role for repeated misconduct. His line manager was once again the source of concerns and led to him recieving a verbal warning for acting above his position and later a first and final formal written warning for 'deliberately misleading his line manager' and making unsubstansiated claims against the senior leaders regarding the planting of innappropriate files on the school network. . He finally faced the sack for deliberately misleading his line manager over the the completion of his GCSE controlled assessment. A misconduct hearing stated he broke the exam and school rules, allowing drafts to be made which was against the exam board rules. Every single incident ever pointed at him was strenuously denied - exactly what happened when I encountered his antics. Prior to my departure, I had raised a suspicion that he was offering students too much assistance in their written coursework, as I suspected he had written sections of a low ability student's submission, whilst scribing for him. I did not get the opportunity to formally report this. I would like others to know these truths as he expertly turned his appalling conduct against me and became the victim whilst I took time off. Had this history been known, the outcome may have been different. I feel much better knowing the truth as in the end he left me feeling my career and reputation was in tatters and I was to blame. I could have handled things better, but the senior team did nothing when I was clearly struggling. I have moved on and feel so much happier. But I cant help feeling like this should be shared to expose him for who he really is. What would you do.