"But while doing that I'd been following a variety of fields in science and technology, including the work in molecular biology, genetic engineering, and so forth"

K. Eric Drexler's quote suggests that he has actually been actively engaged in a large range of scientific and technological fields. He has been keeping up with the most recent developments in molecular biology and genetic engineering, among other areas. This implies that he has actually been actively looking into and discovering these topics, likely in order to stay up to date with the current developments in the field. His quote likewise recommends that he is skilled in the different fields of science and technology, and is likely a professional in the field. This quote is a testimony to Drexler's devotion to staying informed and experienced about the most recent advancements in science and technology.