Glaser was embedded in pop culture in the '60's and '70's. In '67 he fashioned a poster of Bob Dylan with wildly-colored hair and it sold millions. But, his biggest splash came with the “I ❤️ NY” logo, which it seems was subsequently printed on about a trillion t-shirts.

Glaser's wife, Shirley, said the cause of death was a stroke and renal failure.

Glaser was big in commercial art, which went hand-in-hand with advertising. He was considered one of the boldest artists in his field -- swinging for the fences with radical and colorful designs. One of the boldest ... he created art for a 1968 Olivetti typewriter ad. He used a piece of 15th century art featuring a grieving dog and strategically placed an Olivetti at the feet of the dead nymph the dog was mourning.

As for the “I ❤️ NY” campaign ... it was launched in 1977 to promote tourism when New York really needed it, and it was a sensation. What's amazing ... he sketched the image on the back of an envelope with a red crayon while sitting in the back of a cab. The logo helped define the Big Apple.

And, check out his modesty ... he told The Village Voice back in 2011 ... “I’m flabbergasted by what happened to this little, simple nothing of an idea."

After 911, Glaser modified the design to ... “I ❤️ NY More Than Ever,” but this time the heart had a bruise.

And, there's this great quote ... “I’m a person who deals with visual material whatever it is — architecture, an object, a set of plates, wallpaper — right now I’m doing T-shirts.”