吴汉章1929年出生于明尼苏达州，祖籍广东台山。幼年随家人搬家到香港，9岁时因抗战局势恶化，全家搬回明尼苏达州。小时候，吴汉章曾经 在父亲的带领下在明尼苏达州的华人小区用中文演讲为抗战募捐。

从1954年开 始，吴汉章一直活跃于好莱坞，已出演了500多个性格各异的电影、电视剧角色，号称千面手(a man with 1000 faces)。

吴汉章曾经给多部动画片配音，包括《木兰》、《功夫熊猫》等

吴汉章提到《妖魔大闹唐人街》(Big Trouble in Little China)里那个妖魔。“那个时候每天要花10个小时来化妆成一个妖魔，不像现在很多效果可以通过计算机合成。”

另外一个角色是2002年的法国电影“The Idol（爱欲寻邻）”，在片中他出演男主角，为此还必须学会400个法语单词。“我很高兴拍这部法语片。想不到是一部法国电影使我第一次获得出演男主角的机会。很多年来，我在好莱坞电影中的角色大都是洗衣工、餐馆老板等，往往是被白人演的超级英雄解救。”

除了演电影之外，吴汉章还在多部热门电视剧中客串过，比如90年代初期的《宋飞正传》(Seinfield)、90年代后期的“Drew Carey Show”、《老友记》(Friends)以及目前还在播出的《生活大爆炸》(Big Bang Theory)等。

Growing up in Edmonds, Washington, a life in Hollywood seemed far off, but after Brett Davern began performing in local theatre as a young boy, he knew acting was his calling. While in high school, Brett earned a scholarship to "Stagedoor Manor Performing Arts Training Center," one of the most exclusive summer camps for the performing arts, located in upstate New York. This program features an eclectic group of alumni including Oscar nominees Robert Downey, Jr. and Natalie Portman, Emmy-winner Jon Cryer, as well as stage and screen actress Bryce Dallas Howard. Davern continued to hone his craft in college, studying theatre at the American Musical and Dramatic Academy (AMDA) in New York City.

Soon after graduating AMDA, Brett landed the sought after role of "William Messerman" in Chad Lowe's directorial debut, Beautiful Ohio, in which he had the opportunity to work with seasoned actors such as Oscar-winner William Hurt, Emmy-winner Julianna Margulies and Rita Wilson.

Since arriving to Los Angeles, Davern has quietly amassed a body of work that encompasses both television and film. Most recently, he wrapped the independent feature Junk, set to hit the festival circuit in the near future. Brett also starred opposite Mathew Lillard and Rachelle Lefevre in the coming-of-age comedy Pool Boys, and played the introverted "Whisper" in the feature film Triple Dog opposite Brittany Robertson and Scout Taylor Compton. His television credits include popular television dramas such as CSI: Miami, In Plain Sight, Medium, and Cold Case, in which he played Kathryn Morris's younger, troubled brother in the recurring role of "Finn."

Along with his daily workout regiment, Brett Davern is an avid snowboarder, wake boarder and enjoys playing soccer, football, and baseball. Davern currently resides in Los Angeles.