Gregg Lemkau was always a bit of a geek, but he learned to hide it early. “He’d be reading a comic book or some light magazine, and inside it would be a textbook,” recalls former Dartmouth College head soccer coach Bobby Clark of the young Lemkau, who played goalie for a team that made it to the National Collegiate Athletic Association’s Division I quarterfinals in 1990. Although Lemkau was studious, Clark adds, he competed hard and never stopped smiling.

Those qualities have served the father of four well. In September, Goldman Sachs Group named London-based Lemkau head of mergers and acquisitions for Europe, the Middle East, Africa and Asia-Pacific. He previously co-led the technology, media and telecommunications division with George Lee; Anthony Noto has succeeded him in that role. Lemkau, 42, left the post on a high note: This year Goldman ranks first in the TMT sector, with $107.6 billion in deal volume through mid-October, according to Dealogic — a 39 percent jump over the whole of 2010, when the firm ranked sixth.

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