Lancaster's first skeptical web site, Stop Kaz, went online in September 2004.
It is devoted to critical examination of the public statements of Kaz Demille-Jacobsen.
She claimed to be a survivor of the September 11 attacks and gave speeches on that topic. "
Everything that she claimed seemed to be a lie", Lancaster found.
He documented his efforts to create the site in a paper presented at TAM 4 in 2006.

Lancaster opened Stop Sylvia Browne, a web site devoted to critically examining the claims of self-proclaimed psychic Sylvia Browne, in November 2006.
He said he did so because, "I found her work with missing children to be incredibly offensive."
Lancaster has subsequently been interviewed as an expert on Browne's missteps  in the Shawn Hornbeck case on CNN and elsewhere.
The site has also documented other failings of Browne, including the Holly Krewson missing person case.
 In a 2002 episode of The Montel Williams Show, Browne said Krewson was at that time working as a stripper in Los Angeles; however, in 2006, her dental records were matched to a body that had been found in 1996.
In 2013, Browne again came under criticism for her false prediction about Amanda Berry.

Lancaster presented at skeptic conferences including The Amazing Meeting (TAM) in 2006, 2007, 2008 and 2009.
He has been interviewed on The Paul Harris Show, Penn Radio, The Skeptics' Guide to the Universe, Beyond Reality Radio and The Paracast.

In October 2008, during Lancaster's recovery from a stroke he suffered several months prior, the domain registration for StopSylvia.com lapsed and was purchased by Boris Kreiman, who replaced the site with one advertising psychic services.
 When challenged by supporters of Lancaster, Kreiman offered to sell the domain back for $20,000 and put it up for auction.
 Lancaster's wife decided not to negotiate with Kreiman, and instead moved the site to an existing alternate domain, StopSylviaBrowne.com.

On July 11, 2009, Lancaster received the Citizen Skeptic Award from the James Randi Educational Foundation at TAM 7 in Las Vegas, Nevada for his work as a skeptical activist.
 He had recovered sufficiently from his stroke to receive the award in person.

In September 2010 Lancaster was interviewed in STOCKYARD Magazine. "
People want answers", Lancaster said. "
Answers to questions which, often, nobody else has been able to answer for them.
Answers which law enforcement officials, medical providers, and loved ones cannot provide."

In March 2011 Lancaster began hosting the Internet radio show Resident Skeptic on the Para-X Paranormal radio network, in which he gives the skeptical point of view on various paranormal topics.
Three months later Lancaster stepped down from hosting Resident Skeptic due to medical issues.
Lancaster's first skeptical web site, Stop Kaz, went online in September 2004. It is devoted to critical examination of the public statements of Kaz Demille-Jacobsen. She claimed to be a survivor of the September 11 attacks and gave speeches on that topic. "Everything that she claimed seemed to be a lie", Lancaster found. He documented his efforts to create the site in a paper presented at TAM 4 in 2006.
Lancaster opened Stop Sylvia Browne, a web site devoted to critically examining the claims of self-proclaimed psychic Sylvia Browne, in November 2006. He said he did so because, "I found her work with missing children to be incredibly offensive." Lancaster has subsequently been interviewed as an expert on Browne's missteps  in the Shawn Hornbeck case on CNN and elsewhere. The site has also documented other failings of Browne, including the Holly Krewson missing person case.  In a 2002 episode of The Montel Williams Show, Browne said Krewson was at that time working as a stripper in Los Angeles; however, in 2006, her dental records were matched to a body that had been found in 1996. In 2013, Browne again came under criticism for her false prediction about Amanda Berry.
Lancaster presented at skeptic conferences including The Amazing Meeting (TAM) in 2006, 2007, 2008 and 2009. He has been interviewed on The Paul Harris Show, Penn Radio, The Skeptics' Guide to the Universe, Beyond Reality Radio and The Paracast.
In October 2008, during Lancaster's recovery from a stroke he suffered several months prior, the domain registration for StopSylvia.com lapsed and was purchased by Boris Kreiman, who replaced the site with one advertising psychic services.  When challenged by supporters of Lancaster, Kreiman offered to sell the domain back for $20,000 and put it up for auction.  Lancaster's wife decided not to negotiate with Kreiman, and instead moved the site to an existing alternate domain, StopSylviaBrowne.com.
On July 11, 2009, Lancaster received the Citizen Skeptic Award from the James Randi Educational Foundation at TAM 7 in Las Vegas, Nevada for his work as a skeptical activist.  He had recovered sufficiently from his stroke to receive the award in person.
In September 2010 Lancaster was interviewed in STOCKYARD Magazine. "People want answers", Lancaster said. "Answers to questions which, often, nobody else has been able to answer for them. Answers which law enforcement officials, medical providers, and loved ones cannot provide."
In March 2011 Lancaster began hosting the Internet radio show Resident Skeptic on the Para-X Paranormal radio network, in which he gives the skeptical point of view on various paranormal topics. Three months later Lancaster stepped down from hosting Resident Skeptic due to medical issues.
Robert S. Lancaster