Els took master courses with José L. Romanillos and studied the registration of historical guitars. From 1987 to 1994, she worked as a technical assistant at the Musical Instrument Museum in Brussels.

In 1990, she began teaching at the ILSA, where she has taught guitar making for more than 20 years. For the past few years, she has concentrated on teaching drawing and technology classes.

She has also worked regularly with J.L. Romanillos on the documenting of historical guitars.