The director of engineering at Google, Ray Kurzweil, said that in just over 30 years, humans will be able to upload their minds onto computers and become digitally immortal.
He also said that by 2100, our body parts will be replaced with mechanical parts made of nanotechnology, enabling us to live forever.
Kurzweil made the claims during a speech at Global Futures 2045 International Congress in New York.
Dmitry Itskov created the conference, where many shared their thoughts about what the world will look like by 2045.
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"Based on conservative estimates of the amount of computation you need to be functionally simulate a human brain, we'll be able to expand the scope of our intelligence a billion-fold," Kurzweil said.
In his book, titled "The Singularity is Near," he discusses the journey humans will take to get to the singularity.
The singularity is the point at which humans will live forever because a person's intelligence will be digitally stored even after death.
He also believes that through neural engineering, we will be able to replace biological functions. Strides are already being taken to get to that point, one example being the recent invention of the cochlear implant and the creation of a prosthetic ear through 3D printing.
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Martine Rothblatt, CEO of biotech company United Therapeutics, also talked about the idea of "mindclones."
She said digital versions of humans that can live forever would run on a software for consciousness.
"The first company that develops mindware will have [as much success as] a thousand Googles," Rothblatt said.
Kurzweil discussed it further and said, "We're going to be increasingly non-biological to the point where the non-biological part dominates and the biological part is not important anymore."
"In fact, the non-biological part - the machine part - will be so powerful it can completely model and understand the biological part. So even if that biological part went away it wouldn't make any difference."