Hal Patino is a bass guitar

Bass guitar

The bass guitar is a stringed instrument played primarily with the fingers or thumb , or by using a pick....

 player who has been a member of the King Diamond

King Diamond (band)

King Diamond is the heavy metal band that King Diamond formed after the split up of his heavy metal band Mercyful Fate, and the departure of Hank Shermann. He was joined by most members of the then defunct Mercyful Fate. The Satanic focus was replaced by a focus on horror stories...

 and Force of Evil

Force of Evil (band)

Force of Evil was a Danish 5-piece heavy metal band formed by the twin guitarists of Mercyful Fate, Michael Denner and Hank Shermann. They joined forces with Hal Patino, Bjarne T. Holm and Martin Steene, all known for their performance with King Diamond, Mercyful Fate and Iron Fire.-Formation:Force...

 metal bands. He also played in Blakk Totem, Maltese Falcon, Palladion and Doctor Butcher.
On May 4, 2010 the band Pretty Maids

Pretty Maids

Pretty Maids are a Danish heavy metal band from Horsens, Denmark. Formed in 1981 by Ronnie Atkins and Ken Hammer. Their sound and music can be described as classic guitar-laden heavy rock with a strong emphasis on melodic elements like vocals and keyboards....

 announced that Hal will be their new bass player, replacing Kenn Jackson. He left the band in early 2011, due to musical differences.

In King Diamond

King Diamond (band)

King Diamond is the heavy metal band that King Diamond formed after the split up of his heavy metal band Mercyful Fate, and the departure of Hank Shermann. He was joined by most members of the then defunct Mercyful Fate. The Satanic focus was replaced by a focus on horror stories...

 he appeared on several albums:

• "Them" (1988)
• The Dark Sides (1989)
• Conspiracy (1989)
• The Eye
  The Eye (King Diamond album)
  - Personnel :* King Diamond - vocals, keyboards* Andy LaRocque - guitars* Pete Blakk - guitars* Hal Patino - bass* Snowy Shaw - drums* Roberto Falcao - keyboards...
  
   (1990)
• Abigail II: The Revenge
  Abigail II: The Revenge
  - Credits :*King Diamond – Vocals, Keyboards*Andy LaRocque – Guitar, Keyboards*Mike Wead – Guitar*Hal Patino – Bass*Matt Thompson – Drums*Kol Marshall – Additional Keyboards, Strings and Harpsichord...
  
   (2002)
• The Puppet Master
  The Puppet Master (album)
  The Puppet Master is an album by King Diamond released in 2003. A limited edition includes a DVD on which King Diamond is telling the story of The Puppet Master...
  
   (2003)
• Deadly Lullabyes
  Deadly Lullabyes
  Deadly Lullabyes Live is a live album from King Diamond, which was recording during The Puppet Master promotion tour. It spans two discs...
  
   (2004)
• Give Me Your Soul... Please (2007)

He was known to be a part of the amazing trio including Pete Blakk and Andy LaRocque

Andy LaRocque

Andy LaRocque is best known as a guitarist, songwriter, and occasional synth player for the band King Diamond.-Biography:...

.

Hal Patino also has a son, who is the lead singer of the band Maryann Cotton.