C. John Mack II, an educator in the overseas divisions of the University of Maryland University College who in retirement ran an environmental-systems business specializing in water and wastewater treatment, died Dec. 7 at his home in Annapolis. He was 77.

The cause was melanoma, said his stepson, Arthur Soontornsaratool.

In the 1960s and 1970s, Dr. Mack was posted in Japan, Iceland, Germany, Vietnam, Canada and Thailand as a lecturer and administrator with Maryland’s overseas educational program, which provides college-level courses for U.S. military men and women.

Corneal John Mack II was born in Washington. In his early years, he lived at the Mayflower Hotel, where his father was general manager and vice president. He graduated from Georgetown Preparatory School in 1954 and from the University of Notre Dame in 1958.

In 1961, he received a master’s degree in business administration from Harvard University. In 1978, He received a doctorate in adult and continuing education from the University of Virginia.

Since 1985, he had lived in Annapolis. Since 1990, he had been self-employed as the operator of Tolly Environmental Systems, specializing in water and wastewater treatment.

In 1985, he married Tasanee Soontornsaratool. Besides his wife, of Annapolis, survivors include a stepson, Arthur Soontornsaratool of Baltimore; and a sister, Marilyn Mack Jarboe of Washington.

— Bart Barnes