The same way you would write to anyone else.
Literally, John Deere.
The John Deere company was started in 1837.
John Deere Plow Company Building was created in 1911.
The only reason the tractor was called a "John Deere" is because it was built and sold by the company he started, "Deere & Company".
"John Deere Green is famous for founding the company Deere & Company, which is one of the world's largest and leading agricultural and construction equipment manufacturer."
I'm pretty sure he was 18. I will get back to you on that.
John Deere is a publicly held company, with stockholders who are the owners. You can read more about them, and their annual report, below.
John Deere was founded in 1837. He was born in 1804, which makes out that he was 33 when he started the company.
"I will never put my name on a product that does not have in it the best that is in me," quote from John Deere
The Company, Deere and Company was founded by John Deere who was an American blacksmith during the 1800s. John Deere was responsible for inventing the first steel plow in 1837. It was this invention that led to the company's ever growing production of tractors, and other types of farm and agricultural equipment.
John Deere, or "Deere & Company".
The John Deere Company slogan, " I will never put my name on a product that does not have in it the best which is in me," was written and coined by John Deere, the man himself.