-LRB- CNN -RRB- -- A jury in Manhattan found the son of Brooke Astor and one of his lawyers guilty Thursday of scheming to bilk millions of dollars from the late philanthropist 's estate . Anthony Marshall was convicted of bilking millions of dollars from the estate of his mother , Brooke Astor . The verdict , returned on the 12th day of deliberation , ended a six-month trial that featured as witnesses a Who 's Who of New York 's social elite . Anthony Marshall showed no visible reaction as he was found guilty of 14 of the 16 counts against him . His wife , Charlene , who many believed fanned his greed and instigated his mistreatment of his elderly mother , also did not seem to react . Marshall was convicted of the most serious charges -- first-degree grand larceny and scheming to defraud . One of the most serious convictions involved Marshall giving himself a $ 1 million-a-year raise for handling his mother 's affairs , said Assistant District Attorney Joel Seidemann . Marshall 's former lawyer , Francis Morrissey , was convicted of all five counts against him , including forgery and scheming to defraud Astor . Watch Marshall 's attorney vow to appeal '' `` These defendants , two morally depraved individuals , preyed on a physically and mentally ill 101-year-old woman to steal millions of dollars -- dollars that she had intended to go to help the lives of ordinary New Yorkers , '' Seidemann said , echoing his closing argument to the jury . Astor , who had Alzheimer 's disease , was 105 when she died in August 2007 . The prosecution called nearly 70 witnesses -- Henry Kissinger , Graydon Carter , Barbara Walters , Vartan Gregorian and Annette de la Renta among them . Prosecutor Seidemann called the case `` disturbing , '' and said the trial told the story of `` how a son , an only son , would stoop so low to steal from his own mother in the sunset years of her life in order to line his own pockets and the pockets of his wife . '' Marshall , who is free on $ 100,000 bail , faces a maximum 25 years in prison when he is sentenced on December 8 . Morrissey faces up to seven years in prison . Author Meryl Gordon , who has followed the Astor story for years , was in the courtroom when the jury returned its verdicts . `` It was an incredibly bad , intense time , '' she said from her cell phone before hopping on a subway . `` I was a little surprised that Charlene did not get visibly teary . I guess she was braced for it . '' Marshall , Astor 's only child , was indicted on criminal charges in 2006 . The case kicked off a tabloid feeding frenzy that fostered headlines such as `` Bad heir day , '' `` Mrs. Astor 's disaster '' and `` DA 's kick in the Astor . '' Through her late husband 's Vincent Astor Foundation , Brooke Astor is credited with giving New York , where the Astors made their fortune , about $ 200 million . The Astor Foundation gave millions to New York cultural jewels -- including the Metropolitan Museum of Art and the New York Public Library -- as well as lower-profile programs . Astor was often quoted as saying , `` Money is like manure ; it 's not worth a thing unless it 's spread around . '' `` Mrs. Astor stood in New York as a symbol of generosity . And this trial stands as a landmark for the nefarious impact of money and greed , '' said her longtime friend , Vartan Gregorian , president of the Carnegie Corporation of New York . `` It will in many ways tarnish her memory , '' he said . `` It 's a sad day , but at the same time , one good thing that will come out of this -- that Mrs. Astor would approve of -- is that the elderly can not be abused . '' The case began when Marshall 's son , Philip , filed a petition in 2006 asking the court to appoint a guardian for his grandmother . The court documents alleged `` elder abuse '' and were intended to remove Anthony Marshall 's control of her affairs and transfer care to Astor 's dear friend Annette de la Renta . He reacted to the verdict in an e-mail : `` I hope this brings some consolation and closure for the many people , including my grandmother 's loyal staff , caregivers and friends , who helped when she was so vulnerable and so manipulated , '' Philip Marshall wrote . `` I sincerely hope these sad circumstances contribute to the recognition of elder abuse and exploitation as a growing national problem . '' CNN 's Ann O'Neill contributed to this story