Bueno, mi experiencia como profesor de matemáticas ha sido muy gratificante.
Well, my experience as a math teacher has been very gratifying.
Caption 7, Profesor de matemática - EntrevistaPlay Caption
In English the term "professor" is reserved for those with high level university faculty positions, but in Spanish profesor can be used for "school teacher" at any grade level, including university (profesor universitario). Andrés Valencia, who teaches secondary school, uses profesor in the phrase above when he says:
"Well, my experience as a math teacher has been very gratifying."
Note: The term catedrático, is only used at the university level and can refer to a "university professor," "full professor," "department chair" and other such things. Its use seems to vary some from country to country as to how lofty a height one has to reach in the ivy tower before gaining this title.
In this clip Venezuelan restaurant owner Emiro Graterol tells us a little bit about his father.
Mi papá fue maestro de escuela, director de las escuelas de las compañías petroleras Shell, en aquel entonces.
My dad was a school teacher, head of the schools of the Shell oil companies, in those days.
Captions 6-9, Emiro - La Historia de EmiroPlay Caption
Emiro's father taught at the K-12 level, and Emiro uses the alternate term maestro, which can also be used to mean "teacher."
"My father was a school teacher."