He was known as Dr. Wilgus. He operated the Bach Hospital in Jackson, Kentucky for many years. He was well-known and highly respected, all across southeastern Kentucky. His specialty was treating gunshot wounds.

An old record described the Bach Hospital as follows: The Bach Hospital was finished March 20, 1916. It is located on Main Street on U.S. 15, built of native blue sandstone and is four stories high. All corridors, stairs, basebaords, and floors are of marble. Walls are plastered and painted a soft green. One elevator. Basement floor is divided into nurses rooms, dining room, electrically equipped kitchen. Office, reception rooms, consulation room, and X-Ray room, are on the first floor in the front end of the building. The modern operating room is on the second floor, and in this room there has been performed 19,000 operations since the opening of the hospital. The hospital is electrically equipped throughout. Thirteen beds, two bassinets, and twelve rooms are on both the second and third floors. The staff is composed of the owner of the hospital, Dr. Wilgus Bach, a member of the College of American Surgery, having performed more than the required number of operations in a certain length of time. Dr. Frank Sewell, a graduate of Vanderbilt College, Nashville, Tennesse is assistant surgeon. There are three nurses, graduates of accredited hospitals.

He also became very interested in the genealogy of his family. He hired genealogists, both in America and Europe, and he also interviewed as many elderly people as he could find, in southeastern Kentucky. In the early 1900s, he wrote a manuscript that documented his research. He confirmed that the family had originally come from Thuringia, Germany, and that they had come to America and settled in Culpeper County, Virginia, in the mid-1700s. The son of the immigrant, Joseph Back, married Elizabeth Hoffman-Maggard, and they migrated to Kentucky. They arrived there, in the spring of 1791, and they settled along Quicksand Creek. They were the first members of the Bach (also spelled as Back) family, in what later became Breathitt County. Their descendants later spread to other counties in southeastern Kentucky.

Dr. Bach's manuscript presents the same genealogy that had been passed down within the family for generations. It is now kept at the Kentucky Historical Society, in Frankfort. However, sadly, sometime around 1978, someone took an ink pen and a bottle of "white out" and made changes to it, all of which were incorrect, trying to change his research.

The old Bach Family Bible (actually a Catechism, which is similar to a Bible) was in his possession for many years. It is now kept at the Breathitt County Library, in Jackson.

He died of strep throat when he was just 49 years old, in 1936.

In 1959, his father, and his father's second wife Ina, built "The Bach Memorial Chapel" on Hwy. 30, in Quicksand, to honor Dr. Wilgus and Dr. Wilgus' mother, Mary Jane Bach, who had died in 1923. The Board of Trustees, who raised the money to build it, were Dr. Wilgus' father, Hiram Bach, his second wife Ina Shrum Bach, Dr. Wilgus' widow Amanda Bach, his brothers (Dr. Bert Bach, Dr. Luther Bach, and Dr. Arthur Bach), and his sister Edith Bach Henry.