President Barack Obama:

"For a generation of Americans – and especially Chicagoans – Roger was the movies. When he didn't like a film, he was honest; when he did, he was effusive – capturing the unique power of the movie to take us somewhere magical. Even amidst his own battles with cancer, Roger was as productive as he was resilient – continuing to share his passion and perspective with the world. The movies won't be the same without Roger."

Richard Corliss, Time:

His connection with readers was a communal, reciprocal pleasure. Rare for a critic, he was as interested in other people’s opinions as his own. Roger was startlingly at ease with his celebrity, never shriveling in the limelight, always amicable to strangers who approached him at film festivals. He was sharing his thoughts on the Internet before friend was a verb; today, his Twitter following numbers 841,148. And never, not ever, did he suffer from writer’s block, which must have made his enforced silence during the year of his calamitous surgeries a hell of several kinds.

For the rest of his 46 years as a critic, Roger streamed millions of words, by voice or print, by digital or social media. He could not have achieved this ceaseless prodigality if he did not also have an enlightened capitalist’s organizational mastery of his midsize empire of journalism and movie love. You don’t build a career like his — actually, there was no career like his — without optimism, discipline and a sharp business sense. He made millions and earned every penny.

Steven Zeitchik, Los Angeles Times:

"Before Ebert, there was plenty of smart film criticism. But movie-related essays could also be windy and inaccessible. Ebert, picking up in some ways on the democratic spirit of Pauline Kael (though with his own spin) was part of a movement to change all that. Using a direct and entertaining prose style, his nonetheless sophisticated print reviews (he was one of the first critics to win a Pulitzer Prize) ensured that people far away from film scholarship could understand and use the same analytical tools that critics did."

Carrie Rickey,

Of all Mr. Ebert's contributions to film culture - which include 17 books - the greatest were his love of movies, which was contagious, and his ability to express that love in language as accessible as it was entertaining. He was a movie omnivore who delighted in Japanese cinema, American action flicks and exploitation movies (he even wrote one, Beyond the Valley of the Dolls, in 1970).

 His movie reviews were founded on the principle that "It's not what a movie is about, it's how it's about it." And they expressed complex ideas in simple terms.

Emanuel Levy, via Criticwire:

We did many panels together in various film festivals, including one that I am very proud of moderating. In January 2002, barely four months after Sept 11, Robert Redford and his team at Sundance Film Festival had asked me to moderate a panel on politics and cinema. I proposed Roger Ebert as a participant, along with the filmmakers that were in attendance, including Mira Nair and Barbara Kopple. Redford also took active part in the panel. It was an amazing experience: sad, touching, and illuminating.

Matt Atchity, Rotten Tomatoes:

"He really capitalized on the opportunities for communication on the internet... Ebert's legacy will always loom large over anyone that's writing about movies, and I don't think anyone's going to fill his shoes anytime soon."

Annette Insdorf, Huffington Post:

It's common knowledge that Roger was a smart, witty, opinionated cinephile. He didn't just review movies, but contributed to film scholarship with DVD commentaries and books that revealed his gift for appreciating each film within its own terms. But I got to know another aspect of Roger through our many years of co-hosting the Cannes Film Festival Closing Night for Bravo and IFC -- namely his generosity.

Joe Leydon, Culturemap:

Just as Roger himself found humor in the situation when I told him, during his earliest and seemingly victorious battles with the cancer that would eventually defeat him, that I had lit two candles for him at my neighborhood church as a prayer for his speedy recovery.

 “Thanks, Joe,” he replied. “But you know, the candles work only if you actually pay for them.”

Matthew Ingram, PaidContent:

Twitter didn’t turn Ebert into a star, of course — he was already well known as half of the Siskel and Ebert movie-reviewing team long before he moved online, and his TV presence in turn came about because he was a popular film columnist with the Chicago Sun-Times. But after he was diagnosed with thyroid cancer in 2002, and had to have a series of operations that eventually left him unable to speak without a computer voice simulator, he poured much of his enthusiasm for life and the movies into Twitter and other social-media tools, including his personal blog.

And Tweet reactions:

Maria Popova:

"'Most people choose to write a blog. I needed to.' -Roger Ebert (RIP) on writing and life."

Matt Singer:

"Ebert was the first film critic to win the Pulitzer Prize and a star on the Hollywood Walk of Fame. That's versatility."

Lisa Schwarzbaum

"No kidding, the secret to his on-air energy: Roger Ebert played pattycake with every co-host before taping TV, said it was a must. Fun!"