Background
Kenniff was born in Massapequa, New York, the son of a housewife mother and a New York City Fire Department firefighter father.
Kenniff was born in Massapequa, New York, the son of a housewife mother and a New York City Fire Department firefighter father.
He graduated from Massapequa High School and received a Bachelor of Science degree in biology at the State University of New York at Binghamton.
He received an Doctor of Medicine at New York Medical College, and did a four-year residency at the Long Island Jewish Medical Center, which is affiliated with Albert Einstein College of Medicine, serving as chief resident his final year. Appearing on the first season of, titled: Borneo, he was the twelfth of sixteen contestants to be eliminated and was dubbed "The Alphabet Killer" for his famous "Alphabet Voting" strategy, in which he cast his votes based on the order of contestants" names in the alphabet. Kenniff has said that he wants to be a writer
After appearing on he has made acting appearances on The Guiding Light and has appeared as a medical correspondent on various news programs.
He was on the news staff of the television station WFOR-television, a Columbia Broadcasting System affiliate in Miami, Florida. He was also a Columbia Broadcasting System Healthwatch Network Medical Correspondent from 2004-2008.
He had a weekly one-minute segment on Columbia Broadcasting System radio until 2008. In 2000, Kenniff was a syndicated radio columnist for Winstar Radio (his "Minute" is heard on 200 stations worldwide), and he contributed a weekly health column to the Miami Herald for several years.
Kenniff established a health-news website in 2008, healthapalooza.com.
In 2009, Kenniff began the Doctor Sean Show, a weekly Saturday medical call-in show on WFTL 850 Department of Administration and Management Radio in South Florida. In May 2010, Kenniff"s novel, Etre the Cow, was published.
He later claimed that he chose the system as a way to vote off members of the opposing Pagong tribe, (whose names were all earlier alphabetically than his own tribe) while appearing to do so in a non-deliberate manner.