Not that the onset of the illness was solely work-related by any means (genetics and environment play a very big part), but his illness was was triggered after a few ill-timed downsizings: back when he was married and his wife was pregnant with their first child, they'd just bought their very first home, and Mark's company chose that precise moment to downsize him. Coincidentally, four years later it happened again at another job - right when Mark was expecting his second child. (Perhaps not so coincidentally Mark stopped at two.)
Please note that this does not qualify Mark as a medical expert. He is not able to provide any special advice or treatment to the clients he coaches. Instead, he can offer a sympathetic view of what you might be experiencing.