I'm sorry I can't help, but... I love that lamp!

I don't know who the maker is - but I see them on ebay frequently

I saw this exact lamp at Broadway Antique Market and was going to purchase it but the price was a bit steep. I'll bet that's where they found it. There were no designer tags anywhere on the piece so I have no idea who produced this. Anyway I ended up finding a black one for $25 at a different antique shop in the city.

Mike Brady 1971.

Sorry, I couldn't resist.

It might be a Robert Sonneman design for George Kovacs Lighting.

Looks like a ball or eyeball lamp, retro style. No idea who made that one.

There are some new ones that are table lamps:
http://www.grahamandgreen.co.uk/product.aspx/retro ball desk lamp/-/edx6589.htm

Couple of ball-types here:
http://www.lightica.com.au/shopping/shopdisplayproducts.asp?id=40&cat=FLOOR LAMPS#

And someone at some time wanted one of those tripod lamps. I think.

Eames style here:
http://www.retrodecades.com/

Oh man! Who remembers the cat tail lamp?:
http://www.designat639.com/accessories.htm

Couple more images of ball lamps:
http://www.planetvintagegirl.com/page4.htm

I am the only person who starts off looking for ball lamps and ends up here:
http://retrocrush.buzznet.com/costumes/index.html

It's hard to pin down, not that I know anything about lamps. But there are images here that show similar arm styles or head styles, but the year ranges are 50's, 60's, 70's...

http://www.retromoderndesign.com/lighting/lighting.html

http://www.nohomodern.com/details.php?id=337

I have this exact same lamp in a desk lamp design. I do not know anything about the maker but I do know it belonged to my mother as a child (born 1958).