Brief Summary: RATIONALE: Erlotinib hydrochloride may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Erlotinib hydrochloride may also make tumor cells more sensitive to radiation therapy. Radiation therapy uses high-energy x- rays and other types of radiation to kill tumor cells. Giving erlotinib hydrochloride together with radiation therapy may be an effective treatment for patients with head and neck cancer.PURPOSE: This phase II trial is studying how well giving erlotinib hydrochloride together with radiation therapy works in treating patients with stage III-IV squamous cell cancer of the head and neck.

Detailed Description: PRIMARY OBJECTIVES:I. To determine the time to progression of the combination of the EGFR inhibitor erlotinib and radiation therapy. SECONDARY OBJECTIVES:I. To determine objective response rate, locoregional control rate, duration of response, patterns of failure, overall survival, toxicities and quality of life outcomes of the combination of erlotinib and concurrent radiation therapy.II. To determine the pharmacokinetic profile of erlotinib. Additional analyses of the pharmacokinetic data on patients receiving daily erlotinib treatment via their feeding tube will be conducted. III. To determine the effect of treatment and dose of treatment on biologic correlates in tumor tissue and/or surrounding mucosa, EGFR expression and phosphorylation status, serum markers of angiogenic activity VEGF, sVEGFR-2, sKIT, ICAM, PDGF, fluorescence in situ hybridization (FISH) for ERBB2 for gene amplification, DNA-sequencing of EGFR and ERBB2 genes from DNA extracted from pretreatment biopsy material for mutation screening, gene expression profiling on pre-treatment biopsy material to identify predictors of response to treatment, apoptosis (TUNEL assay), Ki67 (nuclear proliferation antigen)IV. To determine the utility of the comprehensive geriatric assessment, in predicting tolerance to treatment in patients \>= 65 years included in this trial. OUTLINE: Patients receive erlotinib hydrochloride orally or via gastrostomy tube once daily in weeks 1-9 and then for 2 years following completion of radiation therapy. Beginning on day 1 of week 2, patients undergo radiation therapy once daily, 5 times a week, for 5-7 weeks. Treatment continues in the absence of disease progression or unacceptable toxicity.After completion of study treatment, patients are followed up at 6 months, every 3 months for 2 years, and then every 6 months for 2 years.