The son of a career diplomat, he spent his childhood in Washington DC, Asia, and the middle east. Oliver graduated with a Bachelor of Arts degree with a major in Drama in 1983 from Tufts University. He then trained at Shakespeare & Co. with Kristine Linklater.
David E. Kelley originally wanted him to play the role of Bobby Donnell on the TV show The Practice His father, Nicholas Platt, is an ex ambassador to Pakistan, Zambia, & the Phillipines. Attended Tufts University. Three children: Lily (b. 1995), George (b. 1997), and Claire (b. 1999) Has an older brother, Adam Platt and a younger brother, Nicholas Platt Jr. Avid Boston Red Sox fan A second-cousin-once-removed of Diana, Princess of Wales. His mother, Sheila Maynard, is the granddaughter of Cynthia Burke Roche. Cynthia was the sister of Edmund Burke Roche who was the maternal grandfather of Diana, Princess of Wales. Was friends with "Huff" co-star Hank Azaria at Tufts University. High school graduate from the Colorado Rocky Mountain School in Carbondale, Colorado (near Aspen). The school's main curriculum is based on the "Outward Bound" education program, which teaches wilderness survival and expedition courses.