Carl Palmer
In the April 2001 edition of "Modern Drummer" and Portnoy's website, he names Neil Peart, Carl Palmer, Bill Bruford, Terry Bozzio, Billy Cobham, Alan White, Stewart Copeland, Phil Collins, Chester Thompson, Simon Phillips, Nick D'Virgilio, Andy Sturmer, Dave Lombardo, Jon Fishman, Vinnie Colaiuta, Peter Criss, Ringo Starr, Tommy Lee, John Bonham, Lars Ulrich and Keith Moon as influences.