Alex Skolnick is an American musician. He is best known as the lead guitarist and one of the songwriters of the thrash metal band Testament and has played with several other bands, including The Alex Skolnick Trio, Trans-Siberian Orchestra, Savatage and the heavy metal supergroup Metal Allegiance.

Testament is an American thrash metal band from Berkeley, California. Formed in 1983 under the name Legacy, the band's current lineup comprises rhythm guitarist Eric Peterson, lead vocalist Chuck Billy, lead guitarist Alex Skolnick, bassist Steve Di Giorgio and drummer Chris Dovas. Testament has experienced many lineup changes over the years, with Peterson being the only remaining original member, though they have since reunited with Skolnick, who had been out of the band from 1992 to 2005. Billy has been a member of Testament since 1986, when he replaced original singer Steve "Zetro" Souza, who had left to replace Paul Baloff in Exodus. He and Peterson are the only members to appear on all of Testament's studio albums, with the latter being the only constant member overall. The band has released thirteen studio albums, four live albums, five compilation albums, thirteen singles and three DVDs. They are estimated to have sold over 1.4 million albums in the United States since the beginning of the SoundScan era, and over 14 million copies worldwide as of 2016.