For the next two years MacDowell did much composing. Then in June 1884 he returned to America, and in July was married to his former pupil, Miss Marian Nevins, a union which proved to be ideal for both. Shortly after this event the young couple returned to Europe.
The next winter was spent in Frankfort, instructing a few private pupils, but mostly in composing, with much reading of the literature of various countries, and, in the spring, with long walks in the beautiful woods about Frankfort. Wiesbaden became their home during the winter of 1885-6. The same year saw the completion of the second. Piano Concerto, in D minor.
In the spring of 1887, MacDowell, in one of his walks about the town, discovered a deserted cottage on the edge of the woods. It overlooked the town, with the Rhine beyond, and woods on the other side of the river. Templeton Strong, an American composer, was with him at the time, and both thought the little cottage an ideal spot for a home. It was soon purchased, and the young husband and wife lived an idyllic life for the next year. A small garden gave them exercise out of doors, the woods were always enticing and best of all, MacDowell was able to give his entire time to composition. Many beautiful songs and piano pieces were the result, besides the symphonic poem "Lamia," "Hamlet and Ophelia," the "Lovely Aida," "Lancelot and Elaine," and other orchestral works.
In September, 1888, the MacDowells sold their Wiesbaden cottage and returned to America, settling in Boston. Here MacDowell made himself felt as a pianist and teacher. He took many pupils, and made a conspicuous number of public appearances. He also created some of his best work, among which were the two great Sonatas, the "Tragica" and "Eroica." One of the important appearances was his playing of the Second Concerto with the Philharmonic Orchestra of New York, under Anton Seidl, in December, 1894.
In the spring of 1896 a Department of Music was founded at Columbia University, of New York, the professorship of which was offered to MacDowell. He had now been living eight years in Boston; his fame as a pianist and teacher was constantly growing; indeed more pupils came to him than he could accept. The prospect of organizing a new department from the very beginning was a difficult task to undertake. At first he hesitated; he was in truth in no hurry to accept the offer, and wished to weigh both sides carefully. But the idea of having an assured income finally caused him to decide in favor of Columbia, and he moved from Boston to New York the following autumn.
He threw himself into this new work with great ardor and entire devotion. With the founding of the department there were two distinct ideas to be carried out. First, to train musicians who would be able to teach and compose. Second, to teach musical history and aesthetics.
All this involved five courses, with many lectures each week, taking up form, harmony, counterpoint, fugue, composition, vocal and instrumental music, both from the technical and interpretative side. It was a tremendous labor to organize and keep all this going, unaided. After two years he was granted an assistant, who took over the elementary classes. But even with this help, MacDowell's labors were increasingly arduous. He now had six courses instead of five, which meant more classes and lectures each week. Perhaps the most severe drain on his time and strength was the continual correction of exercise books and examination papers, a task which he performed with great patience and thoroughness. Added to all this, he devoted every Sunday morning to his advanced students, giving them help and advice in their piano work and in composition.
Amid all this labor his public playing had to be given up, but composition went steadily on. During the eight years of the Columbia professorship, some of the most important works of his life were produced; among them were, Sea Pieces the two later Sonatas, the Norse and the Keltic, Fireside Tales, and New England Idyls. The Woodland Sketches had already been published and some of his finest songs. Indeed nearly one quarter of all his compositions were the fruit of those eight years while he held the post at Columbia.
In 1896 he bought some property near Peterboro, New Hampshire—fifteen acres with a small farmhouse and other buildings, and fifty acres of forest. The buildings were remodeled into a rambling but comfortable dwelling, and here, amid woods and hills he loved, he spent the summer of each year. He built a little log cabin in the woods near by, and here he wrote some of his best music.
In 1904 MacDowell left Columbia, but continued his private piano classes, and sometimes admitted free such students as were unable to pay. After his arduous labors at Columbia, which had been a great drain on his vitality, he should have had a complete rest and change. Had he done so, the collapse which was imminent might have been averted. But he took no rest though in the spring of 1905 he began to show signs of nervous breakdown. The following summer was spent, as usual, in Peterboro but it seemed to bring no relief to the exhausted composer. In the fall of that year his ailment appeared worse. Although he seemed perfectly well in body, his mind gradually became like that of a child. The writer was privileged to see him on one occasion, and retains an ineffaceable memory of the composer in his white flannels, seated in a large easy chair, taking little notice of what was passing about him, seldom recognizing his friends or visitors, but giving the hand of his devoted wife a devoted squeeze when she moved to his side to speak to him.