Alfred Wegener
The concept of continental drift first came to me as far back as 1910, when considering the map of the world, under the direct impression produced by the congruence of the coastlines on either side of the Atlantic. At first I did not pay attention to the idea because I regarded it as improbable.
From Science: A Four Thousand Year History by Patricia Fara

At the turn of the 20th century, the prevailing view of the earth was that it was slowly cooling and contracting, and — like the skin of a rotting fruit — its surface was wrinkling to produce mountains and valleys. Over time, Alfred Wegener came to disagree, and to conclude that earth's continents had at one time been joined in a single landmass, which he named Pangaea. He further claimed that as continents moved around and smashed into each other, they formed mountains. It was an audacious idea, and geologists bristled with hostility.

Wegener was an astronomer and meteorologist — an outsider. Few geologists of his day liked fantastic theories from outsiders. At a time when many geologists focused on rock dating and fossil collcting, Wegener took the then-unconventional approach of seeing the earth as a whole. Some geologists felt that his research was hasty and selective. Even worse, his ideas rang of catastrophism. Thanks largely to Charles Lyell, 19th-century geology had adopted the theory of uniformitarianism, the idea that the world we see is the result of consistent cycles occurring over vast expanses of time. Catastrophism, the prevailing belief before uniformitarianism — and one influenced by the Old Testament — argued that the world we see is the result of extreme events like worldwide floods and volcanoes. All the world's continents wrenching themselves apart from a single landmass would certainly qualify as a catastrophe.

Although Wegener introduced his theory of continental drift in writing in 1912, his work didn't attract much attention until 10 years later, after it had been translated from his native German into other languages. When the attention did come, it was overwhelmingly negative. Wegener had the big picture right, but had difficulty proving it, and he sometimes had to guess at details. Some of his guesses were just wrong, such as the earth's rotation pushing continents toward the equator. In fact, there is such a propensity toward the equator, but the earth's rotation alone is far too small to move continents. But well beyond the similar shapes in coastlines, he did cite impressive specifics, such as diamond-bearing kimberlites found in both Brazil and South Africa.

Eventually ocean mapping led to the discovery of the Mid-Atlantic Ridge where the seafloor is spreading. What's more, geologists discovered on either side of this ridge signatures of the north and south magnetic poles reversing themselves. Continental drift, supported by the theory of plate tectonics, gradually gained acceptance starting in the mid 1960s.

Unfortunately, Wegener didn't live long enough to see his theory accepted. In 1930, he embarked on an expedition to Greenland, planning to help establish a research station on the summit of Greenland's ice cap. Pack ice stranded his ship offshore, keeping Wegener away from land until the summer was half over. Once he finally did reach land, the combination of harsh conditions and overexertion caused his heart to fail.

If Wegener was right, is uniformitarianism wrong? Uniformitarianism works, provided you extrapolate from a time span long enough to include 100-year floods, movement of continental plates and other processes too extreme to be considered "everyday." Uniformitarianism and catastrophism aren't that contradictory after all.

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