Doctor Who: Most Prolific Writers by Doctor

Top 3 for each doctor (done by stories, then episodes, then seasons, then run time)

Writers 

William Hartnell:

1. Terry Nation = 5.5 stories (32 episodes)

2. Dennis Spooner = 3.5 stories (20 episodes)

3. David Whitaker = 3 stories (10 episodes)

Patrick Troughton:

1. David Whitaker = 4 stories (25 episodes)

2. Kit Pedler = 4 stories (22 epsisodes)

3. Mervyn Haisman & Henry Lincoln = 3 stories (19 episodes) - both wrote all episodes together

Jon Pertwee:

1. Malcolm Hulke = 5.86 stories (37 episodes)

2. Robert Sloman & Barry Letts = 4 stories (24 episodes) - both wrote all episodes together

3. Robert Holmes = 4 stories (16 episodes)

Tom Baker:

1. Robert Holmes = 8 stories (34 episodes)

2. Bob Baker = 6 stories (24 episodes)

3. Dave Martin = 5 stories (20 episodes)

Peter Davison:

1. Eric Saward = 5 stories (15 episodes)

2. Peter Grimewade = 3 stories (12 episodes)

3. Terence Dudley = 3 stories (8 episodes)

Colin Baker:

1. Eric Saward = 2.07 stories (5 episodes)

2. Robert Holmes = 1.36 stories (8 episodes)

3. Pip and Jane Baker = 1.36 stories (7 episodes)

Sylvester McCoy:

1. Stephen Wyatt = 2 stories (8 episodes)

2. Ian Briggs = 2 stories (7 episodes)

3. Ben Araronvitch = 2 stories (7 episodes)

Paul McGann:

1. Mathew Jacobs = 1 story (1 episode)

Christopher Eccleston:

1. Russel T Davis = 6 stories (8 episodes)

2. Steven Moffat = 1 story (2 episodes)

3. Robert Shearman = 1 story (1 episode)

David Tennant:

1. Russel T Davis = 20 stories (26 episodes)

2. Steven Moffat = 3 stories (4 episodes)

3. Gareth Roberts = 3 stories (3 episodes)

Matt Smith:

1. Steven Moffat = 17 stories (20 episodes)

2. Mark Gatiss = 4 stories (4 episodes)

3. Chris Chibnall = 3 stories (4 episodes)

Peter Capaldi:

1. Steven Moffat = 17.5 stories (21 episodes)

2. Jamie Mathieson = 4 stories (4 episodes)

3. Peter Harness = 3 stories (4 episodes)

Jodie Whitaker (so far)

1. Chris Chibnall = 12 stories (14 episodes)

2. Vinay Patel = 2 stories (2 episodes)

3. Peter McTighe = 2 stories (2 episodes)