Harris is charged with 2nd degree murder in Tioga County.
He's accused of killing his wife Michele in 2001, although her body has never been found.
Jury selection took just one day on Monday.
The 12 member jury is made up of 6 men and 6 women.
About 90 witnesses will be called to testify, in a trial that's expected to last at least 3 weeks.
Harris is 45 years old, from the Town of Spencer.
A few years ago he sold his interest in a family owned car dealership in Owego.
He and his wife Michele were divorcing when she disappeared at age 35.
New York does not have a law allowing cameras in the courtroom.
But you will be able to see still pictures of the Harris murder trial.
Judge Martin Smith will allow one camera inside the courtroom.
The news media will share the photographs.
Still pictures can only be taken of Calvin Harris, the judge, prosecution and defense.
Pictures can only be taken of a witness if he or she consents.
In a separate ruling, Judge Smith denied a request for a video camera.
The CBS Show 48 Hours has been following the Harris case.
The producer is not sure if 48 hours will continue without being allowed to videotape the trial.