Larry Fischer was born on November 6, 1944 in Los Angeles, California. From an early age, he experienced major mood swings typical of bipolar disorder, and developed a habit of singing Paul Anka songs at the top of his voice, which he called having "the pep". When his mood worsened, he experienced auditory hallucinations and acted violently toward his family. He attended Fairfax High School but was expelled in 1962 for singing in class. In 1963, he was committed to Camarillo State Hospital for threatening his mother with a knife, and he was diagnosed with paranoid schizophrenia and manic depression. Released one year later, he appeared at numerous talent shows and was discovered by R&B singer Solomon Burke, who gave him the nickname "Wild Man" and brought him along on a tour. Fischer was still living at home at this time, and in 1965, was once again institutionalized for his behavior. According to Fischer, the hospital stays only exacerbated his condition. Fischer was Jewish.