1. Introduction

2. Survey Strategy, Observations and Data Reduction
2.1. Lensing Cluster Sample
2.2. Hubble Space Telescope Data and Reduction
2.3. Ground-based Data and Reduction
2.4. Spitzer Data and Reduction
2.5. Foreground Subtraction
2.6. Final Photometry

3. High Redshift Candidates

4. Spectroscopic Follow-up
4.1. Observations
4.2. Implications

5. Discussion
5.1. Number Densities and the Source Luminosity Function
5.2. Contribution to Cosmic Reionization

6. Conclusions