Who was the guru before him and witch one was after him?

To provide an accurate answer, I would need to know which specific guru you are referring to, as there are many spiritual and religious traditions with different lineages of gurus. For example, in Sikhism, Guru Nanak was the first guru, and Guru Angad was his successor. In other traditions, the lineage may vary. Please specify the context or the particular guru you have in mind.