[2] He also spent time in the field doing geographical surveys in Great Britain and Prussia.

[2][3] One of these was the first PhD in meteorology ever earned in the United States awarded to Oliver Lanard Fassig.

In 1904, Clark was appointed to the rehabilitation committee of the burnt district following the Great Baltimore Fire.

He served as chairman of the subcommittee on highways and helped draw up plans for troop movement in case of invasion during World War I.

[3] Clark died on July 27, 1917, from a stroke at "Stonecrop", his summer home in North Haven, Maine.

[8] For his work at the Johns Hopkins University, one of the dormitories in the Alumni Memorial Residences ("AMRs") has been named after him.