Agree with the above comment regarding Dr Leong, he's really kind and patient. My dad had a lot of questions when we came in for his checkup but the doctor answered them all happily.
You can also check out Dr Colin Tham at the Lucky Plaza in Orchard Rd. My bestfriend did her breast implants with him and they look really good. I've also consulted with him before about fat transfer and I could tell he knows his stuff and very experienced.