He served as court pharmacist for Frederick III and opened the Elephant Pharmacy on Købmagergade in Copenhagen in 1670.

He then went on a study trip to Türol but returned to Denmark in 1664 where he stayed with his brother in Odense for about a year.

In 1668 Becker was called home to Denmark to serve as court pharmacist for Frederick III.

[1] Becker was recognized as an eminent chemist and carried out numerous scientific experiments in his laboratory, often in collaboration with Thomas Bartholin, who praises him in several of his publications.

He published Mithridaticum damocrateum in 1671 and Desriptio Theriacae coelestis in 1704, and contributed to Apotekertaksten in 1672.