The answer is: Luke

Luke 1:3 / Acts 1:1 - From these two verses it is reasonable to assume Luke wrote Acts.

The Book of Acts is often regarded as a thrilling continuation of the Gospel of Luke, showcasing the dramatic early years of the Christian church. Written by Luke, a physician and companion of Paul, Acts dives deep into the adventures and challenges faced by the apostles after Jesus' resurrection. It's fascinating that Luke was not one of the original twelve disciples yet provides this detailed account! His scholarly approach combines both narrative and theology, appearing almost as a historical manuscript aimed at telling the stories of early believers.

Now, a bit of trivia: Did you know that Acts covers approximately 30 years of history? This expansive timeframe shows God's unfolding plan through the expansion of early Christianity, showcasing key figures like Peter and Paul. Each chapter of Acts speaks volumes about companionship and community, concentrating on spreading faith, even in the face of adversity, which gives readers valuable lessons in resilience and hope.

Echoes of Acts can be found throughout the New Testament, as many letters penned by Paul hint at events and ideas stated in this book, enriching our understanding of early Christian beliefs. Interesting also is how, in many ways, the book functions as a bridge: leading from the Gospels' stories of Jesus to the navigational guidance for living out faith in a changing world, which remains relevant to this very day. The journey outlined in Acts truly reminds us that although the early church had its struggles, the spirit of community and shared purpose helped propel its growth.