Sidney Harman and U.S. Rep. Jane Harman (D-CA), in 2009. (MIKE THEILER/Reuters)

The Daily Beast posted a notification about Harman’s death on its site today:

Sidney Harman died last night of complications from acute myeloid leukemia at the young age of almost 93. He first learned of his illness one month ago and remained vigorously engaged as Executive Chairman of Newsweek, and Chairman of the Academy for Polymathic Study at the University of Southern California. He died in Washington, D.C., a city he loved and supported in so many ways, surrounded by his wife and children. Funeral arrangements will be private. Celebrations of Sidney's extraordinary life will be held both in Washington and Los Angeles, at dates still to be determined.

Tributes on Twitter started the moment the Daily Beast announced his death:

It is with great sadness I have to announce that Sidney Harman died last night. All of us at Newsweek mourn his passing.less than a minute ago via web Favorite Retweet ReplyTina Brown

Surprised & saddened to hear Sidney Harman has died He was a great entrepreneur (most recently acquiring Newsweek).less than a minute ago via bitly Favorite Retweet ReplySteve Case

Top of Sidney Harman’s obit. reads “Chairman of Newsweek”- title he assumed at 92. U can never guess at what age u will have defining momentless than a minute ago via web Favorite Retweet ReplyMatthew Orley

Just heard Sidney Harman passed away. Amazing man. He was a visionary. Sending thoughts and prayers to his family and many, many friends.less than a minute ago via web Favorite Retweet ReplyDonna Brazile