Methuselah Children is the first novel and introduces Lazarus Long. From there there is no real chronology, though Time Enough for Love is almost exclusively about him.
While the Lazarus Long character appears in several of Robert Heinlein's works, they are not necessarily part of a strict series that needs to be read in order. However, "Time Enough for Love" is often considered a key novel that introduces Lazarus Long and his background. Other Lazarus Long stories include "Methuselah's Children" and "The Number of the Beast."
"Time Enough for Love" follows Lazarus Long, a futuristic character who is over two thousand years old. He recounts his life experiences, including his romances with multiple partners throughout history. The novel delves into themes of immortality, love, and the value of life.
The series you are thinking of is Hustle.
Robert Cummings was in a TV series called "My Hero". If this is the show your are looking for, Julie Bishop and John Litel were two people who were in the series for 17 episodes along with Robert Cummings.
Robert April never appeared in the Original Series, he appear in one episode of the Animated Series "The Counter-Clock Incident" and was voiced by James Doohan
Robert Langdon is in a series of novels, the best known being The DaVinci Code.
In no particular order: Honda's B series. Honda's K series. Ford's BD series. Toyota's 4age series.
a series of activities meant to produce a particular result
Robert Varkonyi
1979
The Henderson Boys
No.
There is no public information about Lauren Tarshis planning to write more books specifically about Emma-Jean Lazarus at this time. However, she may continue to write new stories or series in the future that focus on different characters or themes. It's always a good idea to keep an eye out for updates from the author.