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 stands as a fascinating sequel to the Gospel of Luke, offering readers a window into the early formation of the Christian church. Often referred to as the "Acts of the Apostles" (though “act” is arguably a playful dig at the majority of Peter and Paul’s shenanigans), Acts invites us into a whirlwind of missionary journeys, apostles facing imprisonment, and miracles that define the era. It's no wonder it flows smoothly out of Luke’s Gospel!

Notably, Luke wasn’t just any physician by trade; he was known to be a detailed writer, providing us with a more thorough account of Jesus' life and teachings. There's something special about his storytelling ability that mingles the dramatic with the faithful.

One really cool trivia bit? In Acts, there’s the striking phrase “Theophilus,” referring to the kind individual that both linked Luke and Acts. This name essentially means "lover of God." Some believe it's a reference to coin a specific person who funded the exploration of early Christianity, while others imagine it as a symbolic address for all readers seeking to journey in faith.

Also, total shoutout to all the women mentioned in Acts—for instance, Lydia, a dealer of purple goods, opened her home and her heart to early followers. In her is a celebration of diversity and community! So, Acts isn't just historical; it’s theological, socio-political, and even shows us a beautiful narrative tapestry connecting all believers.