I'm working in a company for last 10 years and have been a consistent good performer. The management recognises it too. But in the last 2-3 years one person from Finance (same as my level) has been consistently interfering and keeps talking negative about my work. He makes my working as routine and not much significant to current output by constantly talking / pushing to management mentioning negatives of my doings. He is dominating the entire company and our management knows it but doesn't contradict him on face and keep avoiding issues when we talk of it. He controls all our efforts and denies execution / completion even if approved by CEO quoting himself as finance controller and approves for other things who doesn't object to him. On confrontation he avoids us and changes his stance - denies he ever did it. It is becoming very difficult to bear every day frustrations though I haven't allowed him any chance to say on my performance as every year we surpass targets with 10-15% higher achievement and collections front too we succeed efficiently. He is been responsible for legal matters and hasn't been effective of recovery of bad debts and smartly puts onus on others for default / losses. Pl advice me directly on mail only as I've many things to share but above should give you my mindset.

Dear A, I hear you. What still is unclear from what you have shared is what is it that you want clarity on from me? Do you want to build a stronger mindset to deal with the situation? Assuming (I have to assume here because, I don’t know how this is affecting you) that this is possibly keeping you on your toes as to what will be his next move, this maybe affecting your peace of mind; the only thing that I feel you can do is develop a strategy to checkmate him at every instance. By now, you know his pattern of doing things and causing nuisance and then conveniently hiding things, it should give you an edge by simply predicting his next move and staying ahead in the game. Most times, using the mind to strategize is more helpful rather than using it to obsess over why the other person is doing what he/she is doing. We cannot ever control another person’s behaviour, but what we can do is reflect within and play the game smartly without creating a huge ruckus. In the end, based on my assumption, it's your peace of mind that you can be in no matter what happens outside you. Based on the strategy through his patterned behaviour, it should give you a good head start before you embark on any project/meeting/presentation or whatever. You have experienced it and been in the midst of it all; now Observe and Change what you do; without ever thinking that he is the one to change. He will at his own relevant time. Spend your energies not on controlling him but on yourself and how you can plan, evaluate and execute. Focus on oneself can go a long way in changing things; personal pr professional. (My answer is based on what little I could gather from your question) Best wishes.