ACKNOWLEDGMENTS

My thanks to the sponsors of SEP and its director, Prof. Jon Claerbout, for their generous support. My thanks to the sponsor representatives at the annual Fallen Leaf Lake SEP meeting for their enthusiasms in this research. I am indebted to Jon Claerbout and Biondo Biondi, their talks caught my attention in Gaussian beam migration. I am grateful to Spyroz Lazaratos for stimulating discussions.