Michael James MacKenzie Mayer (born 16 April 1977) is a former professional rugby union player who played centre at Bristol, Leeds and representing Scotland.
A strong runner and powerful defender he was hoping to establish himself and Leeds in the top flight and also regain his position in the Scottish international ranks.
Mayer's first season ended unhappily with him sustaining a severe hamstring injury just as he was beginning to cement a starting spot in the team and running into some form and a few tries.
He struggled with fitness and suffered with injuries leading him to give up professional rugby where upon he returned to Watsonians to see out the remainder of his playing years.
After his rugby career had ended early due to injury, he worked as an investment management consultant in Edinburgh.