Pratchett was appointed Officer of the Order of the British Empire (OBE) in 1998 and was knighted for services to literature in the 2009 New Year Honours.
In 2007 he announced online that he had been newly diagnosed with a very rare form of early-onset Alzheimer's called Posterior Cortical Atrophy and in March of 2008 he donated US$1,000,000 to the Alzheimer's Research Trust. What an absolute hero.
Not one to let a life-altering condition slow him down, Terry continues to write and promote charitable acts. In 2012 he collaborated with Stephen Baxter to publish The Long Earth, a science fiction story of parallel worlds and new fontiers. The sequel, The Long War, was published in 2013 with a third in the trilogy, The Long Mars, published in 2014.