The Gradebook

NBA referees, graded

Late-game accuracy from the NBA’s Last Two Minute reports. Each official is ranked on their own record against what an average official would score on the same calls, with the likely range of their rank beside it: close ranks are often a coin flip. The last column is how busy the whistle runs.

Rank	Official	Own vs exp.	Likely rank	Accuracy	Fouls
1	Jason Goldenberg	+4.3	1–10	94.9%	average
2	Brandon Schwab	+3.4	1–25	94.8%	quiet
3	Phenizee Ransom	+3.2	2–23	94.5%	average
4	Tyler Ford	+2.9	3–22	94.3%	busy
5	Matt Myers	+2.9	2–28	94.4%	average
6	CJ Washington	+2.8	3–28	94.2%	average
7	John Butler	+2.4	3–35	93.8%	quiet
8	Simone Jelks	+2.4	2–43	94.8%	average
9	Evan Scott	+2.3	3–39	94.0%	average
10	Natalie Sago	+2.3	4–36	94.1%	quiet
11	Jenna Schroeder	+2.3	4–39	94.5%	quiet
12	Danielle Scott	+2.0	3–45	94.3%	average
13	Matt Kallio	+2.0	3–48	94.3%	average
14	Ashley Moyer-Gleich	+2.0	4–44	94.2%	average
15	Gediminas Petraitis	+1.9	7–36	93.9%	average
16	Ray Acosta	+1.7	8–41	93.9%	quiet
17	Andy Nagy	+1.7	5–49	94.0%	average
18	John Goble	+1.6	9–39	93.9%	average
19	Mark Lindsay	+1.6	9–40	93.8%	average
20	Mousa Dagher	+1.6	7–45	93.8%	busy
21	Jonathan Sterling	+1.6	7–45	93.6%	average
22	Robert Hussey	+1.6	5–53	94.5%	average
23	Dannica Mosher (not on 2026-27 list)	+1.5	4–56	93.8%	–
24	Justin Van Duyne	+1.4	10–44	93.4%	average
25	Brett Nansel	+1.4	8–49	93.5%	average
26	Sean Corbin	+1.4	9–46	93.8%	average
27	J.T. Orr	+1.3	10–48	93.6%	average
28	Mitchell Ervin	+1.2	12–46	93.7%	busy
29	Nate Green	+1.1	8–54	93.9%	average
30	Leon Wood	+1.0	12–51	93.3%	average
31	JB DeRosa	+1.0	13–53	93.6%	average
32	Nick Buchert	+0.9	15–50	93.5%	busy
33	Brandon Adair	+0.9	11–55	93.7%	quiet
34	Bill Kennedy	+0.9	13–53	93.7%	average
35	Zach Zarba	+0.9	16–50	93.6%	average
36	Derek Richardson (not on 2026-27 list)	+0.9	13–54	93.5%	average
37	Dedric Taylor	+0.7	16–54	93.5%	average
38	Karl Lane	+0.7	17–55	93.4%	average
39	Curtis Blair	+0.7	17–54	93.5%	average
40	John Conley	+0.6	12–62	93.4%	average
41	Ben Taylor	+0.6	18–57	93.3%	busy
42	Ed Malloy	+0.3	21–60	93.6%	average
43	Aaron Smith	+0.2	21–62	93.1%	quiet
44	Brian Forte	+0.2	23–60	93.3%	quiet
45	Scott Twardoski	+0.1	23–61	93.0%	average
46	James Capers	−0.1	28–63	93.3%	busy
47	Jacyn Goble	−0.1	25–66	93.4%	average
48	James Williams	−0.3	30–64	93.1%	quiet
49	Pat Fraher	−0.3	30–66	93.2%	average
50	Lauren Holtkamp (not on 2026-27 list)	−0.3	24–70	92.8%	average
51	Rodney Mott	−0.4	30–67	92.9%	average
52	Scott Foster	−0.5	33–66	93.1%	busy
53	Kevin Cutler	−0.5	31–69	93.0%	quiet
54	Marc Davis	−0.5	34–66	93.1%	quiet
55	Tony Brothers	−0.5	34–67	93.3%	busy
56	Kevin Scott	−0.8	36–70	92.8%	quiet
57	Suyash Mehta	−0.8	27–74	92.8%	average
58	Sean Wright	−0.9	38–71	92.9%	busy
59	Brent Barnaky	−0.9	38–72	92.8%	quiet
60	Josh Tiven	−1.1	43–72	92.6%	average
61	Marat Kogut	−1.2	43–74	92.5%	busy
62	David Guthrie	−1.3	44–74	92.7%	average
63	Michael Smith	−1.3	41–75	92.7%	busy
64	Eric Dalen	−1.3	42–75	92.8%	quiet
65	Monty McCutchen (not on 2026-27 list)	−1.5	35–80	91.5%	average
66	Matt Boland (not on 2026-27 list)	−1.5	46–76	92.3%	average
67	Mark Ayotte (not on 2026-27 list)	−1.7	43–78	92.5%	average
68	Kane Fitzgerald (not on 2026-27 list)	−1.8	49–78	92.2%	average
69	Eric Lewis	−1.8	51–78	92.3%	busy
70	Haywoode Workman (not on 2026-27 list)	−1.8	44–79	91.9%	average
71	Courtney Kirkland	−1.9	53–78	92.8%	busy
72	Tony Brown (not on 2026-27 list)	−2.1	49–80	92.1%	average
73	Jason Phillips (not on 2026-27 list)	−2.1	48–80	91.8%	average
74	Mike Callahan (not on 2026-27 list)	−2.2	50–81	91.9%	average
75	Bill Spooner (not on 2026-27 list)	−2.5	48–83	91.0%	average
76	Derrick Collins	−2.6	60–81	92.0%	quiet
77	Scott Wall (not on 2026-27 list)	−3.0	62–83	91.5%	average
78	Dan Crawford (not on 2026-27 list)	−3.1	54–84	90.2%	average
79	Ken Mauer (not on 2026-27 list)	−3.1	64–83	91.6%	average
80	Tom Washington (not on 2026-27 list)	−3.2	67–83	91.8%	quiet
81	Tre Maddox	−3.5	70–83	92.0%	average
82	Bennie Adams (not on 2026-27 list)	−4.0	69–85	90.8%	average
83	Leroy Richardson (not on 2026-27 list)	−4.2	73–85	90.9%	average
84	Ron Garretson (not on 2026-27 list)	−4.9	75–86	90.3%	average
85	Derrick Stafford (not on 2026-27 list)	−5.6	79–86	89.6%	average
86	Gary Zielinski (not on 2026-27 list)	−6.6	82–86	89.2%	average
Not enough graded plays to rank yet
–	Tyler Ricks	+1.4	–	94.1%	average
–	Che Flores	+0.2	–	93.3%	average
–	Sha'Rae Mitchell (not on 2026-27 list)	+1.1	–	95.1%	average
–	J.B. DeRosa (not on 2026-27 list)	+0.1	–	94.0%	average
–	Intae Hwang	−0.1	–	93.7%	average
–	Steve Anderson (not on 2026-27 list)	−0.6	–	91.8%	average
–	JD Ralls	−1.2	–	92.5%	average
–	Pat O'Connell (not on 2026-27 list)	+2.3	–	95.3%	average
–	Cheryl Flores (not on 2026-27 list)	+1.5	–	95.2%	–
–	David Jones (not on 2026-27 list)	−5.9	–	86.5%	average
–	Jenna Reneau	+0.8	–	94.3%	average
–	Eli Roe (not on 2026-27 list)	−3.9	–	87.8%	average
–	Dannica Baroody	+1.6	–	96.4%	average
–	Biniam Maru	+1.1	–	95.6%	average
–	Brent Haskill	+1.7	–	96.2%	average
–	Tyler Mirkovich (not on 2026-27 list)	+1.2	–	95.4%	average
–	Joe Crawford (not on 2026-27 list)	−0.3	–	92.3%	average
–	Bennett Salvatore (not on 2026-27 list)	−3.0	–	83.6%	–
–	Jamahl Ralls (not on 2026-27 list)	−0.4	–	89.9%	–
–	Nate Cearley	+0.2	–	94.0%	average
–	Steven Anderson (not on 2026-27 list)	–	–	–	average
–	J.D. Ralls (not on 2026-27 list)	–	–	–	average

Source: the NBA’s own Last Two Minute reports. Accuracy is the share of graded last-two-minute plays marked correct in the official’s games. The reports do not name who made each call; “own vs exp.” is the official’s own part, in percentage points. Likely rank shows how sure each rank is. Officials need a fair amount of graded late-game work to be ranked. Fouls: busy or quiet only when the likely range sits clear of the league average. Updated each morning; data last built 2026-10-31.