She was a Danish seismologist and the first geophysicist in her home country. She was the first female geophysicist in the world. She identified the Lehmann Discontinuity in the earth which makes a previously unknown boundary at the solid inner core of the earth. She published this in her paper in 1936 which consisted of the interpretation of worldwide shockwave recorded from a large earthquake near Newzealand in 1929. She studied the body wave amplitudes and travel times of seismic waves in the upper mantle. She received various awards from around the world and once she described herself as “the only Danish seismologist”.