Many viewers have their own favorite "Mark moments" and memories. We invite you to share them.

Mark brought to his work a wonderful mix of intelligence and gruff charm.

"Mark loved CNBC and we loved him back. He will be deeply missed," said CNBC President Mark Hoffman.

Tony Fratto, Bob Wright, Jeff Zucker, Kenneth Langone, David Friend, Andy Busch, Vince Farrell, Mike Yoshikami, and others recall the CNBC anchor.

He delivered the tragic news of terrorism without emotion or hysteria. With calm and accurate information, he told us what was happening.

'I feel luckier than anything that I had a chance to know him as a friend.'

The word I've heard more today about Mark Haines than any other is "authentic." He was surely that.

'He was our Huntley, Brinkley, Cronkite and Mike Wallace all in one.'

He was a fierce defender of the rights of the individual investor, a man who loved his family above all else, and he was a dear friend.

Mark had a very keen intellect. He had that penetrating lawyer-like skill of cutting right to the chase in dissecting an argument.

Mark Haines had such an engaging television presence that it is difficult to envision whom CNBC will find to fill his shoes.

A generous talent, he would never berate his co-workers when they fell short (his managers, that's another story, but they usually deserved it). Mark's power was positive.

Mark was not the sort of guy who would come running over to say hello when I dropped in for a visit to CNBC. If I saw him in a hallway, he'd shout "Janie!" on his way to one of his infamous smoking breaks and keep on walking. I loved it.

He knew viewers had strong "BS" detectors. He had a strong one too, which he applied to himself as well as the newsmakers and colleagues.

At first it was Phil "real men drive minivans" LeBeau. Later, he changed it to Phil "floor on the floor" LeBeau and Phil "flaps down" LeBeau.

When the market tanked and NBC Nightly News needed someone to explain it, they asked for Mark. His was the voice of reason.

When I was an executive he would only begrudgingly take my call, which always made me laugh. But that's why he was so great.

To Mark, on air, I was ‘Erb (he dropped the “H”) and since my return he always introduced me saying something like, “Now let’s pay a visit to ‘Erb’s Garden.” I loved it! (Any nickname from Mark was coveted.)

I can remember many a morning when Joe Kernen and I would hear a response from one of our guests that didn’t make any sense and know that within seconds Mark would be all over them.

From the moment he came on the NYSE floor in 2006, Mark was embraced as one of their own.

The NYSE may have been the Mark's home for the many years that he anchored "Squawk on the Street" from that floor, but he also found his way into the hearts of many of the traders here at the Nymex.

He was a huge force in shaping the look, feel, and texture of what has become a staple of broadcast media-cable business news.

Nothing was a better sign that I'd done a good job with a story than if Haines paused, departed from script and reacted or asked me a question after I tossed back to him.

This is a guy who didn't put on airs. He didn't suffer fools, but at the end of the day he really was always fair.

He was the guy who asked the uncomfortable questions, who loved to do what anchors never do — tell his audience what was in the prompter — and why, sometimes, he didn't want to read it.

The great thing about Mark was also the great challenge with Mark, which was that there was no way anyone could control him... not Jack Welch, not Bob Wright, not the President of CNBC... nobody could control Mark.

He always asked the question you would want to ask. He did not ask in some refined manner. Simply, he asked exactly what he felt like asking.

We have enjoyed his company on and off air for many, many years. He is a legend in the business of financial news and it was an honor knowing him.

What a tragedy. I was closer in age to Mark than many. My favorite memories of Mark will be talking about kids.

Just absolutely heartbroken. I don't know how these guys are talking on the air without breaking down.

I was a member of the "Mark Haines Club." Not only did he remember who I was, which was an accomplishment, but I knew I had won his respect when he gave me a classic Haines nickname: "Mike, the shark, Huckman."

It's hard to put in words what Mark Haines has meant to me. And it's hard to narrow it down on such a sad day.