Alex Lifeson , OC ( born Aleksandar Å 1\/2 ivojinoviÄ ; August 27 , 1953 ) is a Canadian musician . He is best known as the guitarist and co-founder for the Canadian rock band Rush . Alex Lifeson , OC ( born Aleksandar Å 1\/2 ivojinoviÄ ; August 27 , 1953 ) is a Serbian-Canadian musician , best known as the guitarist of the Canadian rock band Rush .