His name is Josh McDowell, and he is a liar of the worst order.
He claimed to be an atheist, but from the book, it's pretty obvious
he already drew his conclusions in presenting the "evidence" for Jesus.

A real atheist would have brought up a lot of arguments that
McDowell didn't touch.  That's why I don't believe his claim
that he was an atheist until he researched this stuff.  It's
VERY easy to disprove Christianity by lack of evidence; McDowell
was clearly trying to do the opposite.

Among the many, many, many problems with this book (_Evidence
that Demands a Verdict_) are:

 - argument from authority (Professor xyz said... therefore it's true)
 - argument from increduality (I can't believe xyz...therefore it isn't true)
 - equivocation (confusing authenticity of a manuscript with authenticity
        of its contents)
 - emotional appeal (this is so important...it MUST be true!!!!)
 - argument by force (if you don't believe this, you'll go to hell)
 - deliberate misstatement of fact
 - misleading statements (implies number of manuscripts are total Bibles,
        rather than total pieces of parchment)

The list goes on.  The way you presented your question tells me
that the people who told you of this book are unaware how discredited
the author is.

There are many good Christian philosophers/theologists.  Josh McDowell 
is not one of them.  Reading his book confirmed my atheism; it made me
wonder how stupid someone had to be to believe that stuff.

Read the FAQ on constructing a logical argument.  McDowell violates
almost every example in that handy document.