In 1869, he joined Copenhagen's Cobbling and Roads Administration to work on the removal and redevelopment of the city's old fortifications terrain.

He also created plans for sewage systems in Malmö and Lund as well as roads and sanitary installations in Copenhagen.

[1] Ambt was a board member of the Danish Union of Engineers from its foundation and the chairman in 1901–04.

[1] On 4 March 1874, in Gåborg, Ambt married Thekla Emilie Eleonora Mathilde Johnsen (1855-1917).

She was the daughter of bookbinder and bookdealer Carl Christian Ulrich Jonsen (1817–93) and Charlotte Amalie Hansen (1820–63).

His portrait has also been painted by August Jerndorff ( 1905, Copenhagen City Hall), Knud Larsen (1907, Ingeniørforeningen) and Berthe Wegmann (1918, DSB)- The facade of Copenhagen Central Station features a stone bust of him.

[citation needed] Ambt died on 15 July 1919 and is buried in Copenhagen's Western Cemetery.