There is a painter Renaldo Bellini who is a 4th dimension artist.  I
cannot find any information on him at all.  Is there somewhere I can
look or can you direct me to a location on the net for information? My
employer was asked to finance his work worth millions of dollars.

His official website is http://www.renaldobellini.com or
http://www.sognoproductions.com however they are not responding at the
moment.

The good news: he has his own website.

The bad news: it is no longer functioning.

Using the Wayback Machine internet archive, it is possible to see part
of his website, but not the contact page:
http://web.archive.org/web/20001204182800/http://www.renaldobellini.com/

A contact email given on the site is sognoart@hotmail.com, which
appears to be valid.

The domain renaldobellini.com is owned by:

Rose Productions / Bellini, Renaldo 
renaldo@OC-NET.COM 
27660 Marguerite Parkway, Ste. C273 
Mission Viejo , CA 92690 
800-362-6906
http://www.searchenginez.com/cgi-bin/acewhois.cgi?fqdn=renaldobellini&select=.com&submit2=Whois+search

The address is a mail-drop:
http://www.bnl.com/cgi-bin/mpsd/htgrep.cgi?92692

And OC-NET are/were his website designers:
http://members.oc-net.com/portfolio.asp

The website was also mirrored at sognoproductions.com, owned by:

Alpine Diversified Companies, Inc. 
New accounts division 
P. O. Box 19045 
Anaheim, CA 92817 
US 
Phone: 714-637-5156 
Email: labizmail@aol.com 
http://www.searchenginez.com/cgi-bin/acewhois.cgi?fqdn=sognoproductions&tld=.com

And that's where the trail ends....

I would be most interested to know what Mr. Bellini is referring to
when he calls himself a "4th Dimension" artist. It is my understanding
that after the three standard dimensions of length, width, and depth
(or width, height, and depth), the generally accepted definition of
the 4th Dimension is Time, or Duration. I would love to see exactly
what aspect of his works he claims involves the 4th Dimension (other
than the fact that his works continue to exist once he creates them),
and how that is different from the work of any other artist.

I did find an artist's website which refers to the 4th Dimension:
"However, they also pay tribute to the fourth dimension inherent in
their three-dimensional works: that of community and shared
creativity." (http://www.gracehudsonmuseum.org/events_archive2.html).
I don't know if Mr. Bellini is making reference to this concept.

I realize that an artist may use unusual words to try to make their
work stand out from others, but I have to wonder why Mr. Bellini would
choose to use something that, if he said it to me, would make me (for
one) laugh in his face. My take on this is that your boss has been
given an invitation to be taken for a ride. My purely subjective
opinion is that your boss should decline and opt to drive his own
vehicle.

Good Luck!

If your employer has been asked to finance this artist's work "worth
millions of dollars" without knowing anything about the artist,
perhaps the 4th Dimension spoken of is the limitless dimension of
Hype. ;-)