The answer is: Luke

Acts 1:1 / Luke 1:3 - showing Acts to be a subsequent work of Luke.

The Book of Acts, often regarded as a thrilling sequel to the Gospel of Luke, provides a compelling narrative of the early church after Jesus’s ascension. Isn’t it interesting to note how Luke presents himself as a diligent historian? That's apparent in both volumes, where he emphasizes careful documentation! In Acts 1:1, he references "my former book," which refers straight back to the Gospel. It's as if he's saying, "Hey, if you enjoyed the first part of the story, wait till you see what happens next!"

Let's talk about some unique trivia here: Did you know Luke is the only Gospel writer known to be a physician? This medical background perhaps shaped his attention to detail in recording events, contributing to our understanding of the early Christian community's challenges and triumphs. Throughout Acts, you can sense this caregiver spirit, especially when people miracle-get healed—exactly what you'd expect from someone trained in the arts of healing!

As we trace Acts from the ascension of Christ, through Pentecost, to the ministry of Paul, we witness the transformative power of belief igniting communities. You often encounter echoes through history in this book, revealing broader themes such as inclusion, growth, and the spread of radical love that echoes throughout centuries. How captivating it is to see how the early believers transformed lives and broke boundaries—their resolve is an inspiration even today!