When it comes to handwriting thousands of employees' birthday cards, Belfor Holdings CEO Sheldon Yellen says it's worth the muscle cramps. It's a tradition he started in 1985, when he had a 19 ...

And since 1985, long before Yellen was chief executive, he has written a holiday and birthday card to every employee of the company every single year. Today, as CEO, he handwrites 9,200 cards ...

As Chris Weller of Business Insider shares, Sheldon Yellen, CEO of disaster relief and property restoration company Belfor Holdings, has made giving employees birthday cards a serious habit.

His executive assistant, Gail Kennedy, who coordinated the birthday card campaign, said that over the years, Yellon's cards have made a big difference to employees and they thought heir boss ...